r8col_test, a C++ code which calls r8col(), which contains utility routines for "R8COL" objects, that is, double precision real MxN arrays, considered as N column vectors, each of length M. That is, the data may be thought of as essentially multiple columns, and many operations will be carried out columnwise.
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r8col, a C++ 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.