?asum

Sum up the absolute values of vector elements. For the complex numbers, the absolute values of the real part and imaginary part are summed.

Interface Definition

C interface:

float cblas_sasum(const BLASINT n, const float *x, const BLASINT incx);

double cblas_dasum(const BLASINT n, const double *x, const BLASINT incx);

float cblas_scasum(const BLASINT n, const void *x, const BLASINT incx);

double cblas_dzasum(const BLASINT n, const void *x, const BLASINT incx);

Fortran interface:

RES = SASUM(N, X, INCX)

RES = DASUM(N, X, INCX)

RES = SCASUM(N, X, INCX)

RES = DZASUM(N, X, INCX)

Parameters

Parameter	Type	Description	Input/Output
n	Integer	Number of elements in vector x	Input
x	For dasum, x is of double-precision floating-point type. For sasum, x is of single-precision floating-point type. For scasum, x is of single-precision complex number type. For zasum, x is of double-precision complex number type.	Vector x. The vector size is at least (1+(n-1)*abs(incx)).	Input
incx	Integer	Increment for the elements of vector x	Input

Dependencies

#include "kblas.h"

Examples

C interface:

    int n = 5, incx = 1, incy = 1; 
    /* 
     *  Input X:  0.340188, -0.105617, 0.283099, 0.298440, 0.411647 
     */ 
    float x[5] = {0.340188, -0.105617, 0.283099, 0.298440, 0.411647}; 
 
    float res = cblas_sasum(n, x, incx);
    /* 
     *  Output : 1.438991 
     */

Fortran interface:

      INTEGER :: N=5 
      INTEGER :: INCX=1 
      REAL(4) X(5) 
      DATA X /0.340188, -0.105617, 0.283099, 0.298440, 0.411647/ 
      RES=SASUM(N,X,INCX) 
 
*     Output : 1.438991

Parent topic: KML_BLAS Level 1 Functions