alibLe

RWalib C Array Library User Guide > Relational Operations > alibLe

alibLe

Applies the <= operator element-wise to scalar or array arguments. Like most of the relational operations, this routine returns a Boolean array of 0's and 1's. alibCount and alibFind can be used to count and retrieve the indices of the true values (the 1's). Often a Boolean array is combined with another as input to one of the logical array operations, which in turn produces another Boolean array. The PV-WAVE API for this routine is the operator LE.

Prototypes

void alibLeb( wvlong m, wvlong n, UCHAR *p, UCHAR *q, UCHAR *r )

void alibLes( wvlong m, wvlong n, short *p, short *q, UCHAR *r )

void alibLei( wvlong m, wvlong n, int *p, int *q, UCHAR *r )

void alibLel( wvlong m, wvlong n, wvlong *p, wvlong *q, UCHAR *r )

void alibLef( wvlong m, wvlong n, float *p, float *q, UCHAR *r )

void alibLed( wvlong m, wvlong n, double *p, double *q, UCHAR *r )

Parameters

m — (Input) The number of elements in the first array operand. A value of 0 indicates that the first operand is a scalar.

n — (Input) The number of elements in the second array operand. A value of 0 indicates that the second operand is a scalar. If both operands are arrays then n must equal m.

*p — (Input) The pointer to the first operand.

*q — (Input) The pointer to the second operand.

*r — (Input/Output) The destination array. On return, array r contains the the result of applying <= to the two operands, element-wise. For UCHAR inputs this operation can be done in-place, i.e., r can equal p or q.

Example

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include "alib.h"

void main() {

   /* make up some data for the examples */

   UCHAR *b;

   UCHAR b0[9]={0,8,1,7,2,6,3,5,4}, b1[9]={1,8,2,6,3,6,4,4,5}, b2=4;

   /* make output arrays */

   b = (UCHAR*)malloc(9*sizeof(UCHAR));

   printf( "\n\n show arrays b0 and b1" );

      alibinit( NULL, NULL, NULL, NULL );

      alibPrintArrayb( 1, 1, 1, 9, b0, NULL );

      alibPrintArrayb( 1, 1, 1, 9, b1, NULL );

   printf( "\n\n show where b0 is less than or equal to b2=4" );

      alibLeb( 9, 0, b0, &b2, b );

      alibPrintArrayb( 1, 1, 1, 9, b, NULL );

   printf( "\n\n show where b2=4 is less than or equal to b1" );

      alibLeb( 0, 9, &b2, b1, b );

      alibPrintArrayb( 1, 1, 1, 9, b, NULL );

   printf( "\n\n show where b1 is less than or equal to b0" );

      alibLeb( 9, 9, b1, b0, b );

      alibPrintArrayb( 1, 1, 1, 9, b, NULL );

Output:

 show arrays b0 and b1

   0   8   1   7   2   6   3   5   4

   1   8   2   6   3   6   4   4   5

 show where b0 is less than or equal to b2=4

   1   0   1   0   1   0   1   0   1

 show where b2=4 is less than or equal to b1

   0   1   0   1   0   1   1   1   1

 show where b1 is less than or equal to b0

   0   1   0   1   0   1   0   1   0

Version 2017.1