dasum daxpy dcopy ddot dnrm2 drot drotg drotm drotmg dscal dswap

drot() void drot ( int  n, double  x[], int  incx, double  y[], int  incy, double  c, double  s  ) Applies Givens plane rotation (BLAS 1) Purpose This routine applies the Givens plane rotation constructed by drotg. 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] = c*x[i] + s*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] = -s*x[i] + c*y[i] (i = 0 to n-1)) [in] incy Storage spacing between elements of y. [in] c c (cosine) value. [in] s s (sine) value. Reference BLAS