alibAbs

RWalib C Array Library User Guide > Arithmetic Operations > alibAbs

alibAbs

Returns the absolute value of each element in an array. The PV-WAVE API for this routine is the ABS Function.

Prototypes

void alibAbss( wvlong n, short *p, short *r )

void alibAbsi( wvlong n, int *p, int *r )

void alibAbsl( wvlong n, wvlong *p, wvlong *r )

void alibAbsf( wvlong n, float *p, float *r )

void alibAbsd( wvlong n, double *p, double *r )

void alibAbsc( wvlong n, COMPLEX *p, double *r )

void alibAbsz( wvlong n, DCOMPLEX *p, double *r )

Parameters

n — (Input) The number of elements in the source array.

*p — (Input) The n-element source array.

*r — (Input/Output) The n-element destination array. On return, array r contains the absolute value of each element in array p. For real data-types, the operation can be done in-place, i.e., r can equal p.

Example

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include "alib.h"

void main() {

    /* make up some input data for the examples */

        short    s0[6] = {0,-1,2,-3,4,-5};

    /* make an output array */

        short  s[6];

    printf( "\n\n print the input array s0" );

        alibinit( NULL, NULL, NULL, NULL );

        alibPrintArrays( 1, 1, 1, 6, s0, NULL );

    printf( "\n\n print the absolute value of each element in s0" );

        alibAbss( 6, s0, s );

        alibPrintArrays( 1, 1, 1, 6, s, NULL );

    printf( "\n\n now do the same operation in-place, \n" );

    printf( " and show the result as a (2,3) matrix" );

        alibAbss( 6, s0, s0 );

        alibPrintArrays( 1, 1, 2, 3, s0, NULL );

Output:

 print the input array s0

       0      -1       2      -3       4      -5

 print the absolute value of each element in s0

       0       1       2       3       4       5

 now do the same operation in-place,

 and show the result as a (2,3) matrix

       0       1       2

       3       4       5

Version 2017.1