Rank 2 update for symmetric lower or upper matrix. (blas.SYR2K) C = beta*C + alpha*A*B.T + alpha*B*A.T C = beta*C + alpha*A.T*B + alpha*B.T*A if flags&TRANS matrix C lower triangular if flags&LOWER upper triangular if flags&UPPER
(C, A, B *matrix.FloatMatrix, alpha, beta float64, flags Flags)
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