r8col

r8col, a MATLAB code 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.

Licensing:

The computer code and data files described and made available on this web page are distributed under the MIT license

Languages:

r8col is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Programs:

r8col_test

r8crs, a MATLAB code which contains linear algebra routines for r8crs matrices (real, 64 bit, Compressed Row Storage (CRS) format).

r8ge, a MATLAB code which contains linear algebra routines for R8GE matrices (real, 64 bit, General format).

r8row, a MATLAB code 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.

Source Code:

• i4_log_10.m, returns the integer part of the logarithm base 10 of an integer;
• i4vec_indicator1.m, sets an I4VEC to the indicator vector.
• i4vec_print.m, prints an I4VEC;
• i4vec_transpose_print.m, prints an I4VEC "transposed";
• i4vec_uniform_ab.m, returns a pseudorandom I4VEC in a given range;
• perm1_check.m, checks that a vector represents a 1-based permutation;
• r8col_compare.m, compares two columns of an R8COL;
• r8col_duplicates.m, generates an R8COL with some duplicate columns;
• r8col_find.m, seeks a column of an R8COL equal to a given vector;
• r8col_first_index.m, indexes the first occurrence of values in an R8COL.
• r8col_flip.m, flips each column of an R8COL;
• r8col_indicator.m, returns the indicator matrix as an R8COL.
• r8col_insert.m, inserts a column into an R8COL;
• r8col_insert_test.m
• r8col_max.m, computes the column maximums of an R8COL;
• r8col_max_one.m, rescales an R8COL so each column maximum is 1;
• r8col_mean.m, computes the column means of an R8COL;
• r8col_min.m, computes the column minimums of an R8COL;
• r8col_normalize_li.m, normalizes the columns of an R8COL with respect to the infinity norm;
• r8col_part_quick_a.m, partitions the columns of an R8COL;
• r8col_permute_a.m, permutes the columns of an R8COL;
• r8col_print.m, prints an R8COL;
• r8col_print_some.m, prints some of an R8COL;
• r8col_separation.m, computes the separation between columns of an R8COL.
• r8col_sort_heap_a.m, ascending heapsorts the columns of an R8COL;
• r8col_sort_heap_index_a.m, computes an index vector to ascending sort an R8COL;
• r8col_sort_quick_a.m, ascending quicksorts the columns of an R8COL;
• r8col_sorted_tol_undex.m, returns tolerably unique indexes for a sorted R8COL.
• r8col_sorted_tol_unique.m, returns the tolerably unique columns of a sorted R8COL;
• r8col_sorted_tol_unique_count.m, counts the tolerably unique columns of a sorted R8COL;
• r8col_sorted_undex.m, returns unique indexes for a sorted R8COL.
• r8col_sorted_unique.m, returns the unique columns of a sorted R8COL;
• r8col_sorted_unique_count.m, counts the unique columns of a sorted R8COL;
• r8col_sortr_a.m, ascending sorts one column of an R8COL, and adjusts rows;
• r8col_sum.m, computes the column sums of an R8COL;
• r8col_swap.m, swaps two columns of an R8COL;
• r8col_to_r8vec.m, converts an R8COL to an R8VEC;
• r8col_tol_undex.m, indexes tolerably unique entries in an R8COL.
• r8col_tol_unique_count.m, counts tolerably unique entries in an R8COL;
• r8col_tol_unique_index.m, indexes tolerably unique entries in an R8COL.
• r8col_transpose_print.m, prints the transpose of an R8COL;
• r8col_transpose_print_some.m, prints some of the transpose of an R8COL;
• r8col_undex.m, indexes unique entries in an R8COL.
• r8col_uniform_ab.m, fills an R8COL with scaled pseudorandom numbers.
• r8col_uniform_abvec.m, fills an R8COL with scaled pseudorandom numbers.
• r8col_unique_count.m, counts unique entries in an R8COL;
• r8col_unique_index.m, indexes unique entries in an R8COL.
• r8col_variance.m, computes the variances of an R8COL;
• r8vec_compare.m, compares the order of two R8VEC's;
• 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;