r8col_test, a C code which calls r8col() to demonstrates 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.