GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
Debian 7.3.0(Wheezy) |
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catanf(3) |
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catan, catanf, catanl − complex arc tangents
#include <complex.h>
double
complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex
z);
Link with −lm.
The catan() function calculates the complex arc tangent of z. If y = catan(z), then z = ctan(y). The real part of y is chosen in the interval [−pi/2,pi/2].
One has:
catan(z) = (clog(1 + i * z) − clog(1 − i * z)) / (2 * i)
These functions first appeared in glibc in version 2.1.
C99.
/* Link with "−lm" */
#include
<complex.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
double complex z, c, f;
double complex i = I;
if (argc != 3)
{
fprintf(stderr, "Usage: %s <real>
<imag>\n", argv[0]);
exit(EXIT_FAILURE);
}
z = atof(argv[1]) + atof(argv[2]) * I;
c = catan(z);
printf("catan() = %6.3f %6.3f*i\n", creal(c),
cimag(c));
f = (clog(1 + i
* z) − clog(1 − i * z)) / (2 * i);
printf("formula = %6.3f %6.3f*i\n", creal(f2),
cimag(f2));
exit(EXIT_SUCCESS);
}
ccos(3), clog(3), ctan(3), complex(7)
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
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catanf(3) | |