?sum1

Forms the 1-norm of the complex vector using the true absolute value.

Syntax

res = scsum1( n, cx, incx )

res = dzsum1( n, cx, incx )

Include Files

The FORTRAN 77 interfaces are specified in the mkl_lapack.fi include file (to be used in Fortran programs) and in the mkl_lapack.h include file (to be used in C programs).

Description

Given a complex vector cx, scsum1/dzsum1 functions take the sum of the absolute values of vector elements and return a single/double precision result, respectively. These functions are based on scasum/dzasum from Level 1 BLAS, but use the true absolute value and were designed for use with clacon/zlacon.

Input Parameters

n

INTEGER. Specifies the number of elements in the vector cx.

cx

COMPLEX for scsum1

DOUBLE COMPLEX for dzsum1

Array, DIMENSION at least (1+(n-1)*abs(incx)).

Contains the input vector whose elements will be summed.

incx

INTEGER. Specifies the spacing between successive elements of cx (incx > 0).

Output Parameters

res

REAL for scsum1

DOUBLE PRECISION for dzsum1

Contains the sum of absolute values.