Generic matrix-matrix multpily. (blas.GEMM). Calculates C = beta*C + alpha*A*B (default) C = beta*C + alpha*A.T*B flags&TRANSA C = beta*C + alpha*A*B.T flags&TRANSB C = beta*C + alpha*A.T*B.T flags&(TRANSA|TRANSB) C is M*N, A is M*P or P*M if flags&TRANSA. B is P*N or N*P if flags&TRANSB.
(C, A, B *matrix.FloatMatrix, alpha, beta float64, flags Flags)
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