r8lib
r8lib,
a MATLAB code which
contains utilities for real 64 bit (R8) arithmetic.
Licensing:
The computer code and data files made available on this web page
are distributed under
the MIT license
Languages:
r8lib is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version and
an Octave version and
a Python version and
an R version.
Related Programs:
c8lib,
a MATLAB code which
implements certain elementary functions for
complex 64 bit (C8) variables;
i4lib,
a MATLAB code which
contains many utility routines, integer 32 bit
arithmetic.
quaternions,
a MATLAB code which
carries out some simple arithmetic operations for quaternions.
r8col,
a MATLAB code which
contains utility routines for R8COL's, that is,
real 64 bit MxN arrays, considered as N column vectors,
each of length M. The data may be thought of as a matrix of
multiple columns, and many operations will be carried out columnwise.
r8lib_test
r8poly,
a MATLAB code which
contains a number of utilities for polynomials with R8 coefficients,
that is, using real 64 bit arithmetic.
r8row,
a MATLAB code which
contains utility routines for R8ROW's, that is,
real 64 bit MxN arrays, considered as M row vectors,
each of length N. The data may be thought of as a matrix of
multiple rows, and many operations will be carried out rowwise.
Source Code:
-
boolean_to_string.m,
returns "True" or "False", given a boolean value.
-
c8_sqrt_r8.m,
returns the complex square root of an R8;
-
gamma_log_values.m
returns some values of the logarithm of the Gamma function.
-
gamma_values.m,
returns selected values of the Gamma function.
-
i4_log_10.m,
returns the integer part of the logarithm base 10 of an integer;
-
i4_modp.m,
returns the nonnegative remainder of integer division;
-
i4_sign.m,
returns the sign of an I4.
-
i4_uniform_ab.m,
returns a pseudorandom integer in a given range;
-
i4_wrap.m,
forces an integer to lie between given limits by wrapping.
-
i4int_to_r8int.m,
maps an integer interval to a real interval.
-
i4mat_print.m,
prints an I4MAT;
-
i4mat_print_some.m,
prints some of an I4MAT;
-
i4vec_indicator0.m,
sets an I4VEC to the indicator vector.
-
i4vec_indicator1.m,
sets an I4VEC to the indicator vector.
-
i4vec_permute.m,
permutes an I4VEC in place;
-
i4vec_print.m,
prints an I4VEC;
-
i4vec_uniform_ab.m,
returns a pseudorandom I4VEC in a given range;
-
ksub_next4.m,
compute K-subsets of an N-set, one at a time.
-
legendre_zeros.m,
returns the zeros of the Legendre polynomial of degree N.
-
perm0_check.m,
checks that a vector represents a 0-based permutation;
-
perm0_uniform.m,
selects a random permutation of 0,...,N-1;
-
perm1_check.m,
checks that a vector represents a 1-based permutation;
-
perm1_uniform.m,
selects a random permutation of 1,...,N;
-
r8_abs.m,
returns the absolute value of an R8;
-
r8_acos.m,
computes the inverse cosine;
-
r8_acosh.m,
computes the inverse hyperbolic cosine;
-
r8_add.m,
adds two R8's;
-
r8_agm.m,
computes the arithmetic-geometric mean of two R8's;
-
r8_aint.m,
truncates an R8 to an integer value by rounding towards zero;
-
r8_asin.m,
computes the inverse sine;
-
r8_asinh.m,
computes the inverse hyperbolic sine of a value;
-
r8_atan.m,
computes the arctangent, with regard to the correct quadrant.
-
r8_atanh.m,
computes the inverse hyperbolic tangent of a value;
-
r8_big.m,
returns a "big" R8;
-
r8_cas.m,
returns the "casine" of an R8;
-
r8_ceiling.m,
rounds an R8 "up" towards +oo to the next integer.
-
r8_choose.m,
returns a binomial coefficient as an R8.
-
r8_chop.m,
returns an R8 chopped to a given number
of binary digits;
-
r8_cosd.m,
returns the cosine of an angle given in degrees.
-
r8_cot.m,
computes the cotangent of an angle;
-
r8_cotd.m,
returns the cotangent of an angle given in degrees.
-
r8_csc.m,
returns the cosecant of an R8;
-
r8_cscd.m,
returns the cosecant of an angle given in degrees.
-
r8_cube_root.m,
returns the cube root of an R8;
-
r8_days_to_dhms.m,
converts decimal days into days, hours, minutes, seconds.
-
r8_degrees.m,
converts an angle from radians to degrees.
-
r8_dhms_to_days.m,
converts days, hours, minutes, seconds into decimal days.
-
r8_diff.m,
returns the difference of two R8's to a specified accuracy;
-
r8_digit.m,
returns a decimal digit of an R8;
-
r8_divide_i4.m,
returns an I4 fraction as an R8;
-
r8_e.m,
returns the value of the base of the natural logarithm system;
-
r8_epsilon.m,
returns the R8 roundoff unit;
-
r8_epsilon_compute.m,
computes the R8 roundoff unit;
-
r8_exp.m,
computes the exponential function, avoiding overflow and underflow.
-
r8_factorial.m,
returns N factorial as an R8;
-
r8_factorial_sterling.m
computes Stirling's approximation to the factorial function.
-
r8_factorial_values.m,
returns selected values of the factorial function.
-
r8_factorial2.m,
computes the double factorial function;
-
r8_factorial2_values.m,
returns selected values of the double factorial function.
-
r8_fall.m,
computes a falling factorial as an R8;
-
r8_fall_values.m,
returns selected values of the falling factorial function.
-
r8_floor.m,
rounds an R8 "down" (towards -oo) to the next integer.
-
r8_fractional.m,
returns the fractional part of an R8;
-
r8_gamma.m,
evaluates Gamma(X) for an R8.
-
r8_gamma_log.m,
evaluates Log(Gamma(X)) for an R8.
-
r8_haversine.m,
returns the haversine of an angle;
-
r8_heaviside.m,
evaluates the Heaviside step function;
-
r8_huge.m,
returns a "huge" R8;
-
r8_hypot.m,
returns sqrt ( x^2 + y^2 ) as an R8;
-
r8_is_in_01.m,
is true if an R8 is in [0,1];
-
r8_is_inf.m,
is true if an R8 if plus or minus infinity;
-
r8_is_insignificant.m,
is true if an R8 is insignificant;
-
r8_is_integer.m,
is true if an R8 equals an integer value;
-
r8_is_nan.m,
is true if an R8 is a NaN;
-
r8_log_2.m,
returns the logarithm base 2 of an R8;
-
r8_log_10.m,
returns the logarithm base 10 of an R8;
-
r8_log_b.m,
returns the logarithm base B of an R8;
-
r8_mant.m,
returns the mantissa of an R8;
-
r8_max.m,
returns the maximum of two R8's;
-
r8_min.m,
returns the minimum of two R8's;
-
r8_mod.m,
returns the remainder of R8 division;
-
r8_modp.m,
returns the nonnegative remainder of R8 division;
-
r8_mop.m,
returns a power of -1 as an R8;
-
r8_nint.m,
returns, for a given R8, the nearest integer value;
-
r8_normal_01.m,
returns a unit pseudonormal R8;
-
r8_normal_ab.m,
returns a pseudonormal R8 with mean A and variance B.
-
r8_nth_root.m,
returns the Nth root of an R8.
-
r8_pi.m,
returns the value of Pi as an R8;
-
r8_power.m,
returns the value of an integral power of an R8;
-
r8_power_fast.m,
quickly returns the value of an integral power of an R8;
-
r8_print.m,
prints an R8.
-
r8_radians.m,
converts an angle from degrees to radians.
-
r8_relu.m,
computes max(x,0);
-
r8_rise.m,
computes a rising factorial;
-
r8_rise_values.m,
returns selected values of the rising factorial function.
-
r8_round.m,
rounds an R8 to the nearest integral value.
-
r8_round2.m,
rounds an R8 to a specified number of binary digits.
-
r8_roundb.m,
rounds an R8 to a specified number of digits in a given base.
-
r8_roundx.m,
rounds an R8 to a specified number of decimal digits.
-
r8_secd.m,
returns the secant of an angle given in degrees.
-
r8_sech.m,
evaluates the hyperbolic secant of an R8.
-
r8_sigmoid.m,
evaluates the sigmoid function for an R8.
-
r8_sign.m,
returns the sign of an R8.
-
r8_sign_char.m,
returns a character indicating the sign of an R8.
-
r8_sign_match.m,
is TRUE if two R8's have the same sign.
-
r8_sign_match_strict.m,
is TRUE if two R8's have the same strict sign.
-
r8_sign_opposite.m,
is TRUE if two R8's have opposite sign.
-
r8_sign_opposite_strict.m,
is TRUE if two R8's have strictly opposite signs.
-
r8_sign3.m,
returns the three-way sign of an R8.
-
r8_sincos_sum.m,
simplifies a*sin(cx)+b*cos(cx).
-
r8_sind.m,
returns the sine of an angle given in degrees.
-
r8_softplus.m,
evaluates a smoothed version of the max(x,0) function.
-
r8_sqrt_i4.m,
returns the square root of an I4 as an R8.
-
r8_sqrt_pi.m,
returns the square root of Pi as an R8;
-
r8_swap.m,
swaps two R8's.
-
r8_swap3.m,
swaps three R8's.
-
r8_tand.m,
returns the tangent of an angle given in degrees.
-
r8_tiny.m,
returns a "tiny" R8;
-
r8_to_i4.m,
maps X in [XMIN,XMAX] to I in [IMIN,IMAX];
-
r8_to_r8_discrete.m,
maps R to RD in [RMIN,RMAX] with NR discrete values.
-
r8_uniform_01.m,
returns a unit pseudorandom R8;
-
r8_uniform_ab.m,
returns a scaled pseudorandom R8;
-
r8_unswap3.m,
unswaps three R8's;
-
r8_walsh_1d.m,
evaluates the Walsh function;
-
r8_wrap.m,
forces an R8 to lie between given limits by wrapping.
-
r8_zeta.m,
returns an estimate of the zeta function.
-
r82_dist_l2.m,
returns the L2 distance between a pair of R82's.
-
r82_print.m,
prints an R82;
-
r82_to_c8.m,
uses two R8's to create a C8;
-
r82_uniform_ab.m,
returns a scaled pseudorandom R82 value;
-
r82col_print_part.m,
prints part of an R82ROW.
-
r82row_order_type.m,
finds if an R82ROW is (non)strictly ascending/descending.;
-
r82row_part_quick_a.m,
reorders an R82ROW as part of a quicksort;
-
r82row_permute.m,
permutes the elements of an R82ROW;
-
r82row_print.m,
prints an R82ROW;
-
r82row_print_part.m,
prints part of an R82ROW.
-
r82row_sort_heap_index_a.m,
creates an ascending sort index for the elements of an R82ROW;
-
r82row_sort_quick_a.m,
ascending sorts an R82ROW using quicksort;
-
r82row_uniform_ab.m,
returns a pseudorandom R82ROW;
-
r82vec_order_type.m,
returns the order type of an R82VEC.
-
r82vec_part_quick_a.m,
reorders an R82VEC as part of a quicksort operation.
-
r82vec_permute.m,
permutes an R82VEC.
-
r82vec_print.m,
prints an R82VEC.
-
r82vec_print_part.m,
prints part of an R82VEC.
-
r82vec_sort_heap_index_a.m,
ascending sort index for an R82VEC.
-
r82vec_sort_quick_a.m,
applies ascending quicksort to an R82VEC.
-
r82vec_uniform_01.m,
randomly sets an R82VEC by selecting from the interval [0,1].
-
r82vec_uniform_ab.m,
randomly sets an R82VEC by selecting from the interval [A,B].
-
r83_norm.m,
returns the Euclidean norm of an R83.
-
r8int_to_i4int.m
maps an R8 interval to an I4 interval.
-
r8int_to_r8int.m
maps one R8 interval to another.
-
r8r8_compare.m,
compares two R8R8's;
-
r8r8_print.m,
prints an R8R8, that is, a pair of R8's.
-
r8r8vec_index_insert_unique.m,
inserts unique R8R8 values into an index sorted R8R8VEC;
-
r8r8r8_compare.m,
compares two R8R8R8's;
-
r8r8vec_index_search.m,
searches for an R8R8 value in an index sorted R8R8VEC;
-
r8r8r8vec_index_insert_unique.m,
inserts unique R8R8R8 values into an index sorted R8R8R8VEC;
-
r8r8r8vec_index_search.m,
searches for an R8R8R8 value in an index sorted R8R8R8VEC;
-
r8mat_add.m,
computes C = alpha * A + beta * B for R8MAT's.
-
r8mat_amax.m,
returns the maximum absolute value element in a rectangular R8MAT;
-
r8mat_border_add.m,
adds a "border" of zeros to an R8MAT.
-
r8mat_border_cut.m,
cuts the "border" of an R8MAT.
-
r8mat_cholesky_factor.m,
computes the Cholesky factor L*L' of a symmetric positive definite R8MAT;
-
r8mat_cholesky_factor_upper.m,
computes the upper Cholesky factor R'*R of a symmetric positive definite R8MAT;
-
r8mat_cholesky_inverse.m,
computes the inverse of a symmetric positive definite matrix
using the Cholesky factor;
-
r8mat_cholesky_solve.m,
solves a Cholesky factored linear system A * x = b;
r8
-
r8mat_cholesky_solve_upper.m,
solves an upper-Cholesky factored linear system A * x = b;
-
r8mat_covariance.m,
computes the sample covariance of a set of vector data.
-
r8mat_det_2d.m,
computes the determinant of a 2 by 2 R8MAT;
-
r8mat_det_3d.m,
computes the determinant of a 3 by 3 R8MAT;
-
r8mat_det_4d.m,
computes the determinant of a 4 by 4 R8MAT;
-
r8mat_det_5d.m,
computes the determinant of a 5 by 5 R8MAT;
-
r8mat_diag_add_scalar.m,
adds a scalar to the diagonal of an R8MAT;
-
r8mat_diag_add_vector.m,
adds a vector to the diagonal of an R8MAT;
-
r8mat_diag_get_vector.m,
gets the diagonal of an R8MAT;
-
r8mat_diag_set_scalar.m,
sets the diagonal of an R8MAT to a scalar;
-
r8mat_diag_set_vector.m,
sets the diagonal of an R8MAT to a vector;
-
r8mat_diagonal.m,
returns a diagonal matrix as an R8MAT.
-
r8mat_diff_frobenius.m,
returns the Frobenius norm of the difference of two R8MAT's.
-
r8mat_expand_linear.m,
linearly interpolates new data into an R8MAT;
-
r8mat_expand_linear2.m,
linearly interpolates new data into an R8MAT;
-
r8mat_flip_cols.m,
reverses the order of the columns of an R8MAT.
-
r8mat_flip_rows.m,
reverses the order of the rows of an R8MAT.
-
r8mat_fs.m,
factors and solves a system with one hand side.
-
r8mat_fss.m,
factors and solves a system with multiple right hand sides.
-
r8mat_givens_post.m,
returns a Givens post-multiplier matrix;
-
r8mat_givens_post.m
-
r8mat_givens_pre.m,
returns a Givens pre-multiplier matrix;
-
r8mat_givens_pre.m
-
r8mat_hess.m,
approximates a Hessian matrix via finite differences.
-
r8mat_house_axh.m,
computes A*H, where H is a compact Householder matrix;
-
r8mat_house_form.m,
constructs a Householder matrix from its compact form;
-
r8mat_house_hxa.m,
computes H*A, where H is a compact Householder matrix;
-
r8mat_house_post.m,
returns a Householder post-multiplier matrix;
-
r8mat_house_pre.m,
returns a Householder pre-multiplier matrix;
-
r8mat_identity.m,
sets an R8MAT to the MxN identity matrix;
-
r8mat_indicator.m,
returns the indicator matrix as an R8MAT.
-
r8mat_inverse_2d.m,
computes the inverse of a 2 by 2 R8MAT;
-
r8mat_inverse_3d.m,
computes the inverse of a 3 by 3 R8MAT;
-
r8mat_inverse_4d.m,
computes the inverse of a 4 by 4 R8MAT;
-
r8mat_is_identity.m,
determines if an R8MAT is the identity matrix.
-
r8mat_is_in_01.m,
is true if every entry of an R8MAT is in [0,1];
-
r8mat_is_insignificant.m,
is true if an R8MAT is insignificant relative to another;
-
r8mat_is_integer.m,
is true if all entries of an R8MAT are integers;
-
r8mat_is_significant.m,
is true if an R8MAT is significant relative to another;
-
r8mat_is_symmetric.m,
determines if an R8MAT is symmetric.
-
r8mat_jac.m,
approximates the Jacobian matrix of a function via finite differences.
-
r8mat_kronecker.m,
computes the Kronecker product of two R8MAT's.
-
r8mat_l_inverse.m,
computes the inverse of a lower triangular matrix;
-
r8mat_l_print.m,
prints a compact lower triangular matrix;
-
r8mat_l_solve.m,
solves a lower triangular linear system;
-
r8mat_l1_inverse.m,
computes the inverse of a unit lower triangular R8MAT;
-
r8mat_l1_solve.m,
solves a unit lower triangular linear system;
-
r8mat_l1t_solve.m,
solves a transposed unit lower triangular linear system;
-
r8mat_ldlt_factor.m,
computes the LDLT factors (unit lower triangular L and
diagonal D) for a symmetric matrix.
-
r8mat_ldlt_solve.m,
solves a linear system involving a symmetric matrix that
has been LDLT factored.
-
r8mat_lt_solve.m,
solves a transposed lower triangular linear system;
-
r8mat_lu.m,
computes the LU factors of a rectangular R8MAT;
-
r8mat_max.m,
returns the maximum element in a rectangular R8MAT;
-
r8mat_max_index.m,
returns the index of the maximum element in an R8MAT;
-
r8mat_maxcol_minrow.m,
returns the maximum column minimum row in a rectangular R8MAT;
-
r8mat_maxrow_mincol.m,
returns the maximum row minimum column in a rectangular R8MAT;
-
r8mat_mean.m,
returns the mean of an R8MAT;
-
r8mat_min.m,
returns the minimum element of an R8MAT;
-
r8mat_min_index.m,
returns the index of the minimum element in an R8MAT;
-
r8mat_mincol_maxrow.m,
returns the minimum column maximum row in an R8MAT;
-
r8mat_minrow_maxcol.m,
returns the minimum row maximum column in an R8MAT;
-
r8mat_minvm.m,
computes inverse(A) * B for R8MAT's.
-
r8mat_mm.m,
computes the product of a matrix times a matrix;
-
r8mat_mmt.m,
computes the product of a matrix times a transposed matrix;
-
r8mat_mtm.m,
computes the product of a transposed matrix times a matrix;
-
r8mat_mtv.m,
computes the product of a transposed matrix times a vector;
-
r8mat_mv.m,
computes the product of an R8MAT times a vector;
-
r8mat_nint.m,
rounds the entries of an R8MAT to the nearest integer;
-
r8mat_nonzeros.m,
counts the nonzeros in an R8MAT.
-
r8mat_norm_eis.m,
computes the EISPACK norm of an R8MAT;
-
r8mat_norm_fro.m,
computes the Frobenius norm of an R8MAT;
-
r8mat_norm_fro_affine.m,
computes the Frobenius norm of an R8MAT difference;
-
r8mat_norm_l1.m,
computes the L1 norm of an R8MAT;
-
r8mat_norm_l2.m,
computes the L2 norm of an R8MAT;
-
r8mat_norm_li.m,
computes the L-oo norm of an R8MAT;
-
r8mat_norm_rms.m,
returns the RMS norm of an R8MAT.
-
r8mat_normal_01.m,
returns an R8MAT containing normal random numbers;
-
r8mat_nullspace.m,
computes the nullspace of an R8MAT;
-
r8mat_nullspace_size.m,
sizes the nullspace of an R8MAT;
-
r8mat_orth_uniform.m,
returns a random orthogonal matrix;
-
r8mat_plot.m,
plots an R8MAT, with an optional title;
-
r8mat_plot_symbol.m,
returns a symbol for a double precision number;
-
r8mat_plu.m,
computes the PLU factors of a rectangular R8MAT;
-
r8mat_poly_char.m,
computes the characteristic polynomial of an R8MAT;
-
r8mat_power.m,
computes a positive integer power of a square R8MAT;
-
r8mat_power_method.m,
applies the power method to seek the dominant eigenvalue and
eigenvector;
-
r8mat_print.m,
prints an R8MAT;
-
r8mat_print_some.m,
prints some of an R8MAT;
-
r8mat_product_elementwise.m,
computes the elementwise product of two R8MAT's;
-
r8mat_ref.m,
returns the row echelon form of an R8MAT.
-
r8mat_row_copy.m,
copies a vector into a row of an R8MAT.
-
r8mat_rref.m,
returns the reduced row echelon form of an R8MAT.
-
r8mat_rref_solve_binary.m,
seeks binary solutions (if any) of a row reduced echelon form
linear system.
-
r8mat_rref_solve_binary_nz.m,
seeks binary solutions (if any) of a row reduced echelon form
linear system, but only consider solutions with exactly NZ nonzeros.
-
r8mat_scale_01.m,
shifts and scales an R8MAT to have min 0 and max 1;
-
r8mat_scale_ab.m,
shifts and scales an R8MAT to have min A and max B;
-
r8mat_solve.m,
solves an N by N linear system with multiple right hand sides.
-
r8mat_solve_2d.m,
solves a 2 by 2 linear system using Cramer's rule.
-
r8mat_solve_3d.m,
solves a 3 by 3 linear system using Cramer's rule.
-
r8mat_solve2.m,
computes the solution of an N by N linear system.
-
r8mat_standardize.m,
shifts and scales an R8MAT to have zero mean and unit variance.
-
r8mat_sum.m,
sums an R8MAT.
-
r8mat_symm_eigen.m,
returns a random symmetric matrix with given eigensystem.
-
r8mat_symm_jacobi.m,
applies Jacobi eigenvalue iteration to a symmetric matrix.
-
r8mat_to_plu.m,
factors a general R8MAT to separate P, L, U factors;
-
r8mat_to_r8cmat.m,
copies data from an R8MAT to an R8CMAT.
-
r8mat_to_r8plu.m,
factors a general R8MAT to a condensed PLU factor;
-
r8mat_trace.m,
returns the trace of an R8MAT;
-
r8mat_transpose.m,
transposes an R8MAT;
-
r8mat_transpose_print.m,
prints the transpose of an R8MAT;
-
r8mat_transpose_print_some.m,
prints some of the transpose of an R8MAT;
-
r8mat_u_inverse.m,
returns the inverse of an upper triangular R8MAT;
-
r8mat_u_solve.m,
solves an upper triangular linear system;
-
r8mat_u1_inverse.m,
returns the inverse of a unit upper triangular R8MAT;
-
r8mat_uniform_01.m,
returns a unit pseudorandom R8MAT;
-
r8mat_uniform_ab.m,
returns an R8MAT of scaled pseudorandom numbers;
-
r8mat_uniform_abvec.m,
returns an R8MAT of scaled pseudorandom numbers;
-
r8mat_ut_solve.m,
solves a transposed upper triangular linear system;
-
r8mat_vand2.m,
returns the M by N row Vandermonde matrix;
-
r8plu_det.m,
returns the determinant of an R8LPU matrix.
-
r8plu_inverse.m,
returns the inverse of an R8LPU matrix.
-
r8plu_mul.m,
computes A * x, after A has been factored by R8MAT_TO_R8PLU.
-
r8plu_sol.m,
solves A * x = b, after A has been factored by R8MAT_TO_R8PLU.
-
r8plu_to_r8mat.m,
recovers the matrix A that was factored by R8MAT_TO_R8PLU.
-
r8rows_to_r8mat.m,
copies rowwise data from a vector to a doubly dimensioned array.
-
r8slmat_print.m,
prints a strict lower triangular R8MAT.
-
r8vec_01_to_ab.m,
shifts and rescales data from [0,1] to [A,B];
-
r8vec_amax.m,
returns the maximum absolute value in an R8VEC.
-
r8vec_amax_index.m,
returns the index of the maximum absolute value in an R8VEC.
-
r8vec_amin.m,
returns the minimum absolute value in an R8VEC.
-
r8vec_amin_index.m,
returns the index of the minimum absolute value in an R8VEC.
-
r8vec_any_normal.m,
returns a unit normal vector to a given vector;
-
r8vec_asum.m,
returns the sum of the absolute values of the entries of an R8VEC;
-
r8vec_bin.m,
bins an R8VEC;
-
r8vec_binary_next.m,
returns the next binary R8VEC.
-
r8vec_blend.m,
interpolates an R8VEC given two vectors and weight factors;
-
r8vec_bracket.m,
searches a sorted R8VEC for successive brackets of a value;
-
r8vec_bracket2.m,
searches a sorted R8VEC for successive brackets of a value.
-
r8vec_bracket3.m,
finds the interval containing or nearest a given value;
-
r8vec_bracket4.m,
finds the interval containing or nearest each of a vector of values;
-
r8vec_bracket5.m,
searches a sorted R8VEC for successive brackets of a value.
-
r8vec_bracket6.m,
searches a sorted R8VEC for successive brackets of a vector of values.
-
r8vec_cheby_extreme.m,
creates a vector of Chebyshev Extreme values in [A,B].
-
r8vec_cheby_zero.m,
creates a vector of Chebyshev Zero values in [A,B].
-
r8vec_cheby1space.m,
creates a vector of Type 1 Chebyshev-spaced values in [A,B].
-
r8vec_cheby2space.m,
creates a vector of Type 2 Chebyshev-spaced values in [A,B].
-
r8vec_compare.m,
compares the order of two R8VEC's;
-
r8vec_concatenate.m,
concatenates two R8VEC's;
-
r8vec_convolution.m,
returns the discrete convolution of two R8VEC's;
-
r8vec_convolution_circ.m,
returns the discrete circular convolution of two R8VEC's;
-
r8vec_copy.m,
copies one R8VEC into another;
-
r8vec_correlation.m,
returns the correlation of two R8VEC's;
-
r8vec_covariance.m,
computes the sample covariance of two R8VEC's.
-
r8vec_cross_product_2d.m,
computes the cross product of two R8VEC's in 2D;
-
r8vec_cross_product_affine_2d.m,
computes the affine cross product of two R8VEC's in 2D;
-
r8vec_cross_product_3d.m,
computes the cross product of two R8VEC's in 3D;
-
r8vec_cross_product_affine_3d.m,
computes the affine cross product of two R8VEC's in 3D;
-
r8vec_cum.m,
returns the cumulative sums of an R8VEC;
-
r8vec_cum0.m,
returns the zero-based cumulative sums of an R8VEC;
-
r8vec_dif.m,
computes coefficients for estimating the N-th derivative;
-
r8vec_diff_norm.m,
returns the L2 norm of the difference of two R8VEC's.
-
r8vec_diff_norm_l1.m,
returns the L1 norm of the difference of two R8VEC's.
-
r8vec_diff_norm_l2.m,
returns the L2 norm of the difference of two R8VEC's.
-
r8vec_diff_norm_li.m,
returns the L-oo norm of the difference of two R8VEC's.
-
r8vec_direct_product.m,
forms the elements of the direct product of R8VEC's.
-
r8vec_direct_product2.m,
forms the elements of the direct product of R8VEC's.
-
r8vec_distance.m,
determines the distance between two R8VEC's;
-
r8vec_dot_product.m,
computes the dot product of two R8VEC's;
-
r8vec_dot_product_affine.m,
computes the affine dot product of two R8VEC's;
-
r8vec_entropy.m,
returns the entropy of an R8VEC.
-
r8vec_eq.m,
is true if two R8VEC's are equal;
-
r8vec_even_select.m,
returns the I-th of N evenly spaced values;
-
r8vec_even2.m,
linearly interpolates new numbers into an R8VEC;
-
r8vec_even2_select.m,
returns the I-th of N evenly spaced midpoint values;
-
r8vec_even3.m,
evenly interpolates new data into an R8VEC.
-
r8vec_expand_linear.m,
linearly interpolates new data into an R8VEC.
-
r8vec_expand_linear2.m,
linearly interpolates new data into an R8VEC.
-
r8vec_fill.m,
sets all entries of an R8VEC to a given value.
-
r8vec_first_index.m,
indexes the first occurrence of values in an R8VEC.
-
r8vec_frac.m,
finds the K-th smallest entry of an R8VEC;
-
r8vec_fraction.m,
returns the fraction part of an R8VEC;
-
r8vec_ge.m,
is true if one R8VEC is greater than or equal to another;
-
r8vec_gt.m,
is true if one R8VEC is greater than another;
-
r8vec_heap_a.m,
sets an R8VEC to a ascending heap;
-
r8vec_heap_d.m,
sets an R8VEC to a descending heap;
-
r8vec_histogram.m,
returns a histogram of the entries of an R8VEC;
-
r8vec_house_column.m,
defines a Householder premultiplier that "packs" a column;
-
r8vec_identity_row.m,
returns a row of the identity matrix as an R8VEC.
-
r8vec_i4vec_dot_product.m,
the dot product of an R8VEC and an I4VEC;
-
r8vec_index_delete_all.m,
deletes all occurrences of a value from an indexed sorted list;
-
r8vec_index_delete_dupes.m,
deletes duplicates from an indexed sorted list.
-
r8vec_index_delete_one.m,
deletes one copy of a value from an indexed sorted list.
-
r8vec_index_insert.m,
inserts a value in an indexed sorted list.
-
r8vec_index_insert_unique.m,
inserts a unique value in an indexed sorted list.
-
r8vec_index_order.m,
sorts an integer vector using an index vector.
-
r8vec_index_search.m,
searches for a value in an indexed sorted list.
-
r8vec_index_sort_unique.m,
creates a sort index for an R8VEC.
-
r8vec_index_sorted_range.m,
search index sorted vector for elements in a range.
-
r8vec_indexed_heap_d.m,
creates a descending heap from an indexed R8VEC.
-
r8vec_indexed_heap_d_extract.m,
extract from heap descending indexed R8VEC.
-
r8vec_indexed_heap_d_insert.m,
insert value into heap descending indexed R8VEC.
-
r8vec_indexed_heap_d_max.m,
maximum value in heap descending indexed R8VEC.
-
r8vec_indicator0.m,
sets an R8VEC to the indicator vector;
-
r8vec_indicator1.m,
sets an R8VEC to the indicator vector;
-
r8vec_insert.m,
inserts a new value into an R8VEC;
-
r8vec_is_ascending.m,
is true if all entries of an R8VEC are weakly ascending;
-
r8vec_is_ascending_strictly.m,
is true if all entries of an R8VEC are strictly ascending;
-
r8vec_is_binary.m,
is true if all entries of an R8VEC are 0 or 1.
-
r8vec_is_distinct.m,
is true if all entries of an R8VEC are distinct;
-
r8vec_is_in_01.m,
is true if all enries of an R8VEC are in [0,1];
-
r8vec_is_in_ab.m,
is true if all entries of an R8VEC are in [A,B];
-
r8vec_is_integer.m,
is true if all entries of an R8VEC are integers;
-
r8vec_is_insignificant.m,
is true if an R8VEC is insignificant;
-
r8vec_is_negative.m,
is true if all entries of an R8VEC are strictly negative;
-
r8vec_is_negative_any.m,
is true if any entry of an R8VEC is negative;
-
r8vec_is_nonnegative.m,
is true if all entries of an R8VEC are nonnegative;
-
r8vec_is_nonpositive.m,
is true if all entries of an R8VEC are nonpositive;
-
r8vec_is_nonzero_any.m,
is true if any entry of an R8VEC is nonzero;
-
r8vec_is_one.m,
is true if all entries of an R8VEC are one;
-
r8vec_is_positive.m,
is true if all entries of an R8VEC are strictly positive;
-
r8vec_is_zero.m,
is true if all entries of an R8VEC are zero;
-
r8vec_le.m,
is true if one R8VEC is less than or equal to another;
-
r8vec_legendre.m,
creates a vector of Legendre-spaced values.
-
r8vec_linspace2.m,
returns an R8VEC of values evenly spaced between given limits.
-
r8vec_lt.m,
is true if one R8VEC is less than another;
-
r8vec_max.m,
returns the maximum entry in an R8VEC;
-
r8vec_max_abs_index.m,
returns the index of the maximum absolute value entry in an R8VEC;
-
r8vec_max_index.m,
returns the index of the maximum entry in an R8VEC;
-
r8vec_mean.m,
returns the mean of an R8VEC;
-
r8vec_mean_geometric.m,
returns the geometric mean of an R8VEC;
-
r8vec_mean_running.m,
computes the running averages of an R8VEC;
-
r8vec_mean_update.m,
updates the mean of an R8VEC with one new entry.
-
r8vec_median.m,
returns the median of an R8VEC;
-
r8vec_mesh_2d.m,
creates a 2D mesh from 2 R8VEC's.
-
r8vec_midspace.m,
returns an R8VEC of midpoint values evenly spaced between given limits.
-
r8vec_min.m,
returns the minimum entry in an R8VEC;
-
r8vec_min_index.m,
returns the index of the minimum entry in an R8VEC;
-
r8vec_min_pos.m,
returns the minimum positive entry in an R8VEC;
-
r8vec_mirror_next.m,
steps through all sign variations of an R8VEC;
-
r8vec_mirror_ab_next.m,
steps through all 3^M mirror variations of an R8VEC X in a box
defined by A and B;
-
r8vec_multispace.m,
returns a scaled list of values;
-
r8vec_ne.m,
is true if one R8VEC is not equal to another;
-
r8vec_nint.m,
rounds an R8VEC to the nearest integer.
-
r8vec_norm.m,
returns the L2 norm of an R8VEC.
-
r8vec_norm_affine.m,
returns the affine L2 norm of an R8VEC.
-
r8vec_norm_l0.m,
returns the L0 "norm" of an R8VEC.
-
r8vec_norm_l1.m,
returns the L1 norm of an R8VEC.
-
r8vec_norm_l2.m,
returns the L2 norm of an R8VEC.
-
r8vec_norm_li.m,
returns the L-oo norm of an R8VEC.
-
r8vec_norm_lp.m,
returns the Lp norm of an R8VEC.
-
r8vec_norm_rms.m,
returns the RMS norm of an R8VEC.
-
r8vec_normal_01.m,
returns unit pseudonormal R8VEC.
-
r8vec_normal_ab.m,
returns an R8VEC of random normal values with mean A and variance B.
-
r8vec_normalize.m,
scales an R8VEC to have unit Euclidean norm;
-
r8vec_normalize_l1.m,
scales an R8VEC to have unit l1 norm;
-
r8vec_normsq.m,
returns the squared L2 norm of an R8VEC.
-
r8vec_normsq_affine.m,
returns the squared affine L2 norm of an R8VEC.
-
r8vec_order_type.m,
finds if an R8VEC is (non)strictly
ascending/descending.
-
r8vec_pair_sums.m,
finds all sums formed by a pair of vectors.;
-
r8vec_part_quick_a.m,
reorders an R8VEC as part of a quicksort;
-
r8vec_permute.m,
permutes an R8VEC;
-
r8vec_permute_cyclic.m,
cyclically permutes an R8VEC;
-
r8vec_permute_uniform.m,
randomly permutes an R8VEC;
-
r8vec_polarize.m,
decomnposes an R8VEC into parts parallel
and perpendicular to a given direction;
-
r8vec_print.m,
prints an R8VEC;
-
r8vec_print_16.m,
prints an R8VEC to 16 decimal places;
-
r8vec_print_mask.m,
prints a masked R8VEC;
-
r8vec_print_part.m,
prints "part" of an R8VEC.
-
r8vec_print_some.m,
prints some of an R8VEC;
-
r8vec_product.m,
computes the product of the entries of an R8VEC;
-
r8vec_range.m,
finds the range of Y's within a restricted X range;
-
r8vec_range_2.m,
updates a range to include values in a new array;
-
r8vec_reverse.m,
reverses the entries of an R8VEC;
-
r8vec_rotate.m,
"rotates" the entries of an R8VEC;
-
r8vec_rsquared.m,
returns the R^2 "goodness of fit" statistic;
-
r8vec_rsquared_adjusted.m,
returns the adjusted R^2 "goodness of fit" statistic;
-
r8vec_scalar_triple_product.m,
computes the scalar triple product;
-
r8vec_scale.m,
scales an R8VEC by a factor.
-
r8vec_scale_01.m,
shifts and scales an R8VEC to have min 0 and max 1;
-
r8vec_scale_ab.m,
shifts and scales an R8VEC to have min A and max B;
-
r8vec_search_binary_a.m,
uses binary search on an R8VEC to find the location
of a given value;
-
r8vec_shift.m,
performs a right shift on an R8VEC.
-
r8vec_shift_circular.m,
performs a circular shift on an R8VEC.
-
r8vec_sign3_running.m,
computes the running sign3 of an R8VEC;
-
r8vec_smooth.m,
smooths an R8VEC using averaging;
-
r8vec_softmax.m,
evaluates the softmax function of an R8VEC.
-
r8vec_sort_bubble_a.m,
ascending sorts an R8VEC using bubble sort;
-
r8vec_sort_bubble_d.m,
descending sorts an R8VEC using bubble sort;
-
r8vec_sort_heap_a.m,
ascending sorts an R8VEC using heap sort;
-
r8vec_sort_heap_d.m,
descending sorts an R8VEC using heap sort;
-
r8vec_sort_heap_index_a.m,
computes an index vector to ascending sort an R8VEC;
-
r8vec_sort_heap_index_d.m,
computes an index vector to descending sort an R8VEC;
-
r8vec_sort_heap_mask_a.m,
indexed heap ascending sort of a masked R8VEC;
-
r8vec_sort_insert_a.m,
ascending sorts an R8VEC using insertion sort;
-
r8vec_sort_insert_index_a.m,
ascending index sorts an R8VEC using insertion sort;
-
r8vec_sort_insert_index_d.m,
descending index sorts an R8VEC using insertion sort;
-
r8vec_sort_quick_a.m,
ascending quick sorts an R8VEC;
-
r8vec_sort_shell_a.m,
ascending sorts an R8VEC using Shell's sort;
-
r8vec_sorted_merge_a.m,
merges two ascending sorted R8VEC's;
-
r8vec_sorted_nearest.m,
returns the nearest element in a sorted R8VEC;
-
r8vec_sorted_range.m,
searches a sorted vector for elements in a range.
-
r8vec_sorted_split.m,
"splits" a sorted R8VEC, given a splitting value;
-
r8vec_sorted_undex.m,
returns unique sorted indexes for a sorted R8VEC.
-
r8vec_sorted_unique.m,
returns the unique elements in a sorted R8VEC;
-
r8vec_sorted_unique_count.m,
counts the unique elements in a sorted R8VEC;
-
r8vec_sorted_unique_hist.m,
creates a histogram of the unique elements in a sorted R8VEC;
-
r8vec_split.m,
splits an unsorted R8VEC based on a splitting value;
-
r8vec_standardize.m,
shifts and scales an R8VEC to have zero mean and unit variance.
-
r8vec_std.m,
returns the standard deviation of an R8VEC;
-
r8vec_std_sample.m,
returns the sample standard deviation of an R8VEC;
-
r8vec_std_sample_update.m,
updates the sample standard deviation of an R8VEC when one more element
has been added.
-
r8vec_std_update.m,
updates the standard deviation of an R8VEC when one more element
has been added.
-
r8vec_step.m,
evaluates a unit step function.
-
r8vec_stutter.m,
makes a "stuttering" copy of an R8VEC;
-
r8vec_sum.m,
returns the sum of the entries of an R8VEC;
-
r8vec_sum_running.m,
computes the running averages of an R8VEC;
-
r8vec_swap.m,
swaps the contents of two R8VEC's;
-
r8vec_transpose_print.m,
prints the "transpose" of an R8VEC.
-
r8vec_undex.m,
returns unique sorted indexes for an R8VEC.
-
r8vec_uniform_01.m,
returns a unit pseudorandom R8VEC.
-
r8vec_uniform_ab.m,
returns a scaled pseudorandom R8VEC;
-
r8vec_uniform_abvec.m,
returns a scaled pseudorandom R8VEC;
-
r8vec_uniform_unit.m,
returns a random unit R8VEC.
-
r8vec_unique_count.m,
counts the number of unique elements in an unsorted R8VEC;
-
r8vec_unique_index.m,
indexes the unique elements in an unsorted R8VEC;
-
r8vec_variance.m,
returns the variance of an R8VEC;
-
r8vec_variance_circular.m,
returns the circular variance of an R8VEC;
-
r8vec_variance_sample.m,
returns the sample variance of an R8VEC;
-
r8vec_variance_sample_update.m,
updates the sample variance of an R8VEC for the addition of one new entry;
-
r8vec_variance_update.m,
updates the variance of an R8VEC for the addition of one new entry;
-
r8vec_vector_triple_product.m,
computes the vector triple product of three R8VEC's;
-
r8vec_wrap.m,
wraps the entries of an R8VEC to lie between given bounds.
-
r8vec_write.m,
writes an R8VEC to a file.
-
r8vec2_compare.m,
compares two entries in an R8VEC2;
-
r8vec2_print.m,
prints an R8VEC2;
-
r8vec2_print_some.m,
prints some of an R8VEC2;
-
r8vec2_sort_a.m,
ascending sorts an R8VEC2;
-
r8vec2_sort_d.m,
descending sorts an R8VEC2;
-
r8vec2_sort_heap_index_a.m,
does an indexed heap ascending sort of an R8VEC2;
-
r8vec2_sorted_unique.m,
keeps unique elements in a sorted R8VEC2;
-
r8vec2_sorted_unique_index.m,
indexes unique elements in a sorted R8VEC2.
-
r8vec2_sum_max_index.m,
returns the index of the maximum sum of two R8VEC's.
-
r8vec3_print.m,
prints an R8VEC3;
-
rms.m,
returns the RMS norm of a vector or matrix;
-
sort_heap_external.m,
externally sorts a list of values into ascending order;
Last revised on 04 November 2021.