Intel® oneAPI Math Kernel Library Developer Reference - Fortran

?cabs1

Computes absolute value of complex number.

Syntax

res = scabs1(z)

res = dcabs1(z)

res = cabs1(z)

Include Files

Description

The ?cabs1 is an auxiliary routine for a few BLAS Level 1 routines. This routine performs an operation defined as 

res=|Re(z)|+|Im(z)|,

where z is a scalar, and res is a value containing the absolute value of a complex number z.

Input Parameters

z

COMPLEX scalar for scabs1.

DOUBLE COMPLEX scalar for dcabs1.

Output Parameters

res

REAL for scabs1.

DOUBLE PRECISION for dcabs1.

Contains the absolute value of a complex number z.

Parent topic: BLAS Level 1 Routines and Functions