alibGt
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
GT.
Prototypes
void alibGtb( wvlong m, wvlong n, UCHAR *p, UCHAR *q, UCHAR *r )
void alibGts( wvlong m, wvlong n, short *p, short *q, UCHAR *r )
void alibGti( wvlong m, wvlong n, int *p, int *q, UCHAR *r )
void alibGtl( wvlong m, wvlong n, wvlong *p, wvlong *q, UCHAR *r )
void alibGtf( wvlong m, wvlong n, float *p, float *q, UCHAR *r )
void alibGtd( 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]={0,7,2,6,3,5,3,4,1}, 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 greater than b2=4" );
alibGtb( 9, 0, b0, &b2, b );
alibPrintArrayb( 1, 1, 1, 9, b, NULL );
printf( "\n\n show where b2=4 is greater than b1" );
alibGtb( 0, 9, &b2, b1, b );
alibPrintArrayb( 1, 1, 1, 9, b, NULL );
printf( "\n\n show where b1 is greater than b0" );
alibGtb( 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
0 7 2 6 3 5 3 4 1
show where b0 is greater than b2=4
0 1 0 1 0 1 0 1 0
show where b2=4 is greater than b1
1 0 1 0 1 0 1 0 1
show where b1 is greater than b0
0 0 1 0 1 0 0 0 0
Version 2017.0
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