index_test, a Fortran90 code which calls index(), which converts the index of a multidimensional array entry into the corresponding index of a one dimensional vector, using either row or column major indexing, with zero or unit base.
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index, a Fortran90 code which converts an M-dimensional vector index to a one-dimensional vector index; it can handle zero and one-based indexing schemes, as well as column major and row major conventions.