alibAtan
Returns the inverse tangent of each element in an array. The PV-WAVE API for this routine is the
ATAN Function.
Prototypes
void alibAtanf( wvlong n, float *p, float *r )
void alibAtand( wvlong n, double *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 inverse tangent of each element in array p. 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 */
float f0[4]={-9,0,1,9}; /* make an output array */
float f[4];
printf( "\n\n show 4-element vector f0" );
alibinit( NULL, NULL, NULL, NULL );
alibPrintArrayf( 1, 1, 1, 4, f0, NULL );
printf( "\n\n show the inverse tangent of each element in f0" );
alibAtanf( 4, f0, f );
alibPrintArrayf( 1, 1, 1, 4, f, NULL );
printf( "\n\n repeat the operation in-place; print result as a matrix" );
alibAtanf( 4, f0, f0 );
alibPrintArrayf( 1, 1, 2, 2, f0, NULL );
}
Output:
show 4-element vector f0
-9.000e+00 0.000e+00 1.000e+00 9.000e+00
show the inverse tangent of each element in f0
-1.460e+00 0.000e+00 7.854e-01 1.460e+00
repeat the operation in-place; print result as a matrix
-1.460e+00 0.000e+00
7.854e-01 1.460e+00
Version 2017.1
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