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* double A[r*c], V[c], Y[r];
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* mvmpy( r, c, A, V, Y );
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* Y[j] = > A[j][k] V[k] , j = 1, ..., r
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* Multiplies the r (rows) by c (columns) matrix A on the left
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* by column vector V of dimension c on the right
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* to produce a (column) vector Y output of dimension r.
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void mvmpy( int, int, double*, double*, double* );
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mvmpy( r, c, A, V, Y )