R8POLY
Polynomials with R8 Coefficients
R8POLY
is a C library which
contains a number of utilities for polynomials with R8 coefficients,
that is, using double precision or 64 bit real arithmetic.
Licensing:
The computer code and data files made available on this web page
are distributed under
the GNU LGPL license.
Languages:
R8POLY is available in
a C version and
a FORTRAN90 version and
a MATLAB version.
Related Data and Programs:
LEGENDRE_PRODUCT_POLYNOMIAL,
a C library which
defines Legendre product polynomials, creating a multivariate
polynomial as the product of univariate Legendre polynomials.
MONOMIAL,
a C library which enumerates, lists, ranks, unranks and randomizes
multivariate monomials in a space of M dimensions, with total degree
less than N, equal to N, or lying within a given range.
POLYNOMIAL,
a C library which
adds, multiplies, differentiates, evaluates and prints multivariate
polynomials in a space of M dimensions.
Source Code:
Examples and Tests:
List of Routines:

I4_MAX returns the maximum of two I4's.

I4_MIN returns the smaller of two I4's.

R8_SIGN returns the sign of an R8.

R82POLY2_PRINT prints a second order polynomial in two variables.

R82POLY2_TYPE analyzes a second order polynomial in two variables.

R82POLY2_TYPE_PRINT prints the meaning of the output from R82POLY2_TYPE.

R8MAT_DET_3D computes the determinant of a 3 by 3 R8MAT.

R8MAT_INVERSE_3D inverts a 3 by 3 R8MAT using Cramer's rule.

R8MAT_PRINT prints an R8MAT.

R8MAT_PRINT_SOME prints some of an R8MAT.

R8POLY_DEGREE returns the degree of a polynomial.

R8POLY_DERIV returns the derivative of a polynomial.

R8POLY_LAGRANGE_0 evaluates the Lagrange factor at a point.

R8POLY_LAGRANGE_1 evaluates the first derivative of the Lagrange factor.

R8POLY_LAGRANGE_2 evaluates the second derivative of the Lagrange factor.

R8POLY_LAGRANGE_COEF returns the coefficients of a Lagrange polynomial.

R8POLY_LAGRANGE_FACTOR evaluates the polynomial Lagrange factor at a point.

R8POLY_LAGRANGE_VAL evaluates the IPOLth Lagrange polynomial.

R8POLY_ORDER returns the order of a polynomial.

R8POLY_PRINT prints out a polynomial.

R8POLY_SHIFT adjusts the coefficients of a polynomial for a new argument.

R8POLY_VALUE evaluates a polynomial using a naive method.

R8POLY_VALUE_HORNER evaluates a polynomial using Horner's method.

R8POLY_VALUES_HORNER evaluates a polynomial using Horner's method.

R8POLY_VALUE_2D evaluates a polynomial in 2 variables, X and Y.

R8POLY2_EX finds the extremal point of a parabola determined by three points.

R8POLY2_EX2 finds the extremal point of a parabola determined by three points.

R8POLY2_RROOT returns the real parts of the roots of a quadratic polynomial.

R8POLY2_VAL evaluates a parabola defined by three data values.

R8POLY2_VAL2 evaluates a parabolic function through 3 points in a table.

R8R8_PRINT prints an R8R8.

R8VEC_COPY_NEW copies an R8VEC.

R8VEC_EVEN_NEW returns an R8VEC of values evenly spaced between ALO and AHI.

R8VEC_EVEN_SELECT returns the Ith of N evenly spaced values in [ XLO, XHI ].

R8VEC_INDICATOR1_NEW sets an R8VEC to the indicator vector {1,2,3,...}.

R8VEC_IS_DISTINCT is true if the entries in an R8VEC are distinct.

R8VEC_LINSPACE_NEW creates a vector of linearly spaced values.

R8VEC_PRINT prints an R8VEC.

R8VEC_TRANSPOSE_PRINT prints an R8VEC "transposed".

R8VEC_ZEROS_NEW creates and zeroes an R8VEC.

ROOTS_TO_R8POLY converts polynomial roots to polynomial coefficients.

S_LEN_TRIM returns the length of a string to the last nonblank.

TIMESTAMP prints the current YMDHMS date as a time stamp.
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the C source codes.
Last revised on 08 August 2018.