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Math - Sparse Arrays

FULSTR Restores a sparse matrix to full storage mode.
READ_SPR Reads a row-indexed sparse matrix from a file.
SPRSAB Performs matrix multiplication on sparse matrices.
SPRSAX Multiplies sparse matrix by a vector.
SPRSIN Converts matrix to row-index sparse matrix.
SPRSTP Constructs the transpose of a sparse matrix.
WRITE_SPR Writes row-indexed sparse array structure to a file.

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