Real Arrays of Rows

**R8ROW**,
a MATLAB library which
contains utility routines for R8ROW's, that is,
double precision real 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.

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

**R8ROW** is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version and
a Python version.

R83, a MATLAB library which contains linear algebra routines for R83 matrices (real, 64 bit, tridiagonal 3xN format).

R83_NP, a MATLAB library which contains linear algebra routines for R83_NP matrices (real, 64 bit, tridiagonal 3xN format, nonpivoting factorization).

R83P, a MATLAB library which contains linear algebra routines for R83P matrices (real, 64 bit, tridiagonal periodic format).

R83S, a MATLAB library which contains linear algebra routines for R83S matrices (real, 64 bit, tridiagonal scalar format).

R83T, a MATLAB library which contains linear algebra routines for R83T matrices (real, 64 bit, tridiagonal Mx3 format).

R83V, a MATLAB library which contains linear algebra routines for R83V matrices (real, 64 bit, tridiagonal three vector format).

R85, a MATLAB library which contains linear algebra routines for R85 matrices (real, 64 bit, pentadiagonal format).

R8BB, a MATLAB library which contains linear algebra routines for R8BB matrices (real, 64 bit, border banded format).

R8BLT, a MATLAB library which contains linear algebra routines for R8BLT matrices (real, 64 bit, band lower triangular format).

R8BTO, a MATLAB library which contains linear algebra routines for R8BTO matrices (real, 64 bit, block Toeplitz format).

R8BUT, a MATLAB library which contains linear algebra routines for R8BUT matrices (real, 64 bit, band upper triangular format).

R8CB, a MATLAB library which contains linear algebra routines for R8CB matrices (real, 64 bit, Compressed Band format).

R8CBB, a MATLAB library which contains linear algebra routines for R8CBB matrices (real, 64 bit, Compressed Border Banded format).

R8CC, a MATLAB library which contains linear algebra routines for R8CC matrices (real, 64 bit, Compressed Column (Colptr,Row,Value) format).

R8CI, a MATLAB library which contains linear algebra routines for R8CI matrices (real, 64 bit, circulant format).

R8COL, a MATLAB library which contains utility routines for R8COL's, that is, double precision real 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.

R8GB, a MATLAB library which contains linear algebra routines for R8GB matrices (real, 64 bit, General Banded format).

R8GD, a MATLAB library which contains linear algebra routines for R8GD matrices (real, 64 bit, general diagonal format).

R8GE, a MATLAB library which contains linear algebra routines for R8GE matrices (real, 64 bit, General format).

R8GE_NP, a MATLAB library which contains nonpivoting linear algebra routines for R8GE matrices (real, 64 bit, General Nonpivoting format).

R8LT, a MATLAB library which contains linear algebra routines for R8UT matrices (real, 64 bit, lower triangular format).

R8LTT, a MATLAB library which contains linear algebra routines for R8LTT matrices (real, 64 bit, lower triangular Toeplitz format).

R8NCF, a MATLAB library which contains linear algebra routines for R8NCF matrices (real, 64 bit, nonsymmetric coordinate format).

R8PBL, a MATLAB library which contains linear algebra routines for R8PBL matrices (real, 64 bit, positive definite symmetric band lower format).

R8PBU, a MATLAB library which contains linear algebra routines for R8PBU matrices (real, 64 bit, positive definite symmetric band upper format).

R8PO, a MATLAB library which contains linear algebra routines for R8PO matrices (real, 64 bit, positive definite symmetric format).

R8PP, a MATLAB library which contains linear algebra routines for R8PP matrices (real, 64 bit, positive definite symmetric packed format).

R8RI, a MATLAB library which contains linear algebra routines for R8RI matrices (real, 64 bit, row indexed format).

R8S3, a MATLAB library which contains linear algebra routines for R8S3 matrices (real, 64 bit, SLAP Triad (I,J,AIJ) format).

R8SD, a MATLAB library which contains linear algebra routines for R8SD matrices (real, 64 bit, symmetric diagonal format).

R8SM, a MATLAB library which contains linear algebra routines for R8SM (Sherman-Morrison) matrices (real, 64 bit, A-u*v' format).

R8SP, a MATLAB library which contains linear algebra routines for R8SP matrices (real, 64 bit, SLAP Triad (I,J,AIJ) format).

R8SR, a MATLAB library which carries out linear algebra operations for R8SR matrices (real, 64 bit, diagonal + compressed row offdiagonal format).

R8STO, a MATLAB library which contains linear algebra routines for R8STO matrices (real, 64 bit, symmetric Toeplitz N format).

R8TO, a MATLAB library which contains linear algebra routines for R8TO matrices (real, 64 bit, Toeplitz 2*N-1 format).

R8UT, a MATLAB library which contains linear algebra routines for R8UT matrices (real, 64 bit, upper triangular format).

R8UTT, a MATLAB library which contains linear algebra routines for R8UTT matrices (real, 64 bit, upper triangular Toeplitz format).

- i4_log_10.m, returns the integer part of the logarithm base 10 of an integer;
- i4_log_10_test.m, returns the integer part of the logarithm base 10 of an integer;
- i4mat_print.m, prints an I4MAT;
- i4mat_print_some.m, prints some of an I4MAT;
- i4vec_print.m, prints an I4VEC;
- i4vec_uniform_ab.m, returns a pseudorandom I4VEC in a given range;
- r8row_compare.m, compares two rows of an R8ROW;
- r8row_indicator.m, returns an R8ROW indicator matrix;
- r8row_max.m, returns the row maximums of an R8ROW.
- r8row_mean.m, returns the row means of an R8ROW.
- r8row_min.m, returns the row minimums of an R8ROW.
- r8row_part_quick_a.m, partitions the rows of an R8ROW;
- r8row_print.m, prints an R8ROW;
- r8row_print_some.m, prints some of an R8ROW;
- r8row_running_average.m, computes the running averages of an R8ROW;
- r8row_running_sum.m, computes the running averages of an R8ROW;
- r8row_sort_heap_a.m, ascending heapsorts the rows of an R8ROW;
- r8row_sort_heap_index_a.m, computes an index vector to ascending sort an R8ROW;
- r8row_sort_quick_a.m, ascending quicksorts the rows of an R8ROW;
- r8row_sum.m, returns the row sums of an R8ROW.
- r8row_swap.m, swaps two rows of an R8ROW.
- r8row_to_r8vec.m, converts an R8ROW into an R8VEC.
- r8row_transpose_print.m, prints an R8ROW, transposed;
- r8row_transpose_print_some.m, prints some of an R8ROW, transposed;
- r8row_uniform_ab.m, returns an R8ROW of scaled pseudorandom numbers;
- r8row_variance.m, returns the row variances of an R8ROW.
- r8vec_eq.m, is true if two R8VEC's are equal;
- r8vec_gt.m, is true if one R8VEC is greater than another;
- r8vec_lt.m, is true if one R8VEC is less than another;
- r8vec_print.m, prints an R8VEC;
- sort_heap_external.m, externally sorts a list of values into ascending order;
- timestamp.m, prints the current YMDHMS date as a timestamp;