dasum daxpy dcopy ddot dnrm2 drot drotg drotm drotmg dscal dswap

drotm() void drotm ( int  n, double  x[], int  incx, double  y[], int  incy, double  p[]  ) Apply modified Givens plane rotation (BLAS 1) Purpose This routine applies the modified Givens plane rotation constructed by drotmg. Parameters [in] n Number of elements in input vectors. (If n <= 0, returns without computation) [in,out] x[] Array x[lx] (lx >= 1 + (n - 1)*abs(incx)) [in] Input vector x. [out] Vector x after rotation. (x[i] = H*x[i] + H*y[i] (i = 0 to n-1)) [in] incx Storage spacing between elements of x. [in,out] y[] Array y[ly] (ly >= 1 + (n - 1)*abs(incy)) [in] Input vector y. [out] Vector y after rotation. (y[i] = H*y[i] - H*x[i] (i = 0 to n-1)) [in] incy Storage spacing between elements of y. [in] p[] Array p[lp] (lp >= 5) Rotation matrix H.   p[0]: -1, 0, 1 or -2.   p[1], p[2], p[3], p[4]: H11, H21, H12, H22 values. See drotmg for a description of data storage in p[]. Reference BLAS