_dasum _daxpy _dcopy _ddot _dnrm2 _drot _drotg _drotm _drotmg _dscal _dswap

_dnrm2() double _dnrm2 ( int  n, double  x[], int  incx  ) ||x||2 (2-norm) (BLAS 1) Purpose This routine computes the Euclidean norm of a vector (2-norm). Returns Euclidean norm of a vector x (= sqrt(x^T*x)) (2-norm). Parameters [in] n Number of elements in vector x. (If n <= 0, returns 0) [in] x[] Array x[lx] (lx >= 1 + (n - 1)*incx) Input vector x. [in] incx Storage spacing between elements of x. (If incx <= 0, returns 0) Reference BLAS