(S|D|SC|DZ)NRM2¶

Single, double, single complex, and double complex NRM2.

Description¶

Computes the Euclidean norm of a vector.

$\result = \sqrt{ \sum_{i=1}^N {\abs{x_{i}}^2} }$

BLAS Interface¶

float  snrm2(const qml_long *N, const float *X, const qml_long *INCX);

double dnrm2(const qml_long *N, const double *X, const qml_long *INCX);

float  scnrm2(const qml_long *N, const qml_single_complex *X, const qml_long *INCX);

double dznrm2(const qml_long *N, const qml_double_complex *X, const qml_long *INCX);

CBLAS Interface¶

float  cblas_snrm2(const qml_long N, const float *X, const qml_long INCX);

double cblas_dnrm2(const qml_long N, const double *X, const qml_long INCX);

float  cblas_scnrm2(const qml_long N, const qml_single_complex *X,
                    const qml_long INCX);

double cblas_dznrm2(const qml_long N, const qml_double_complex *X,
                    const qml_long INCX);

Arguments¶

N	Number of elements in X
X	First input vector, must be at least: $(\fvar{N}-1)\mult\abs{\fvar{INCX}} + 1$
INCX	Distance between individual elements in X