GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
Debian 7.3.0(Wheezy) |
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cacos(3) |
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cacos, cacosf, cacosl − complex arc cosine
#include <complex.h>
double
complex cacos(double complex z);
float complex cacosf(float complex z);
long double complex cacosl(long double complex
z);
Link with −lm.
The cacos() function calculates the complex arc cosine of z. If y = cacos(z), then z = ccos(y). The real part of y is chosen in the interval [0,pi].
One has:
cacos(z) = −i * clog(z + i * csqrt(1 − z * z))
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 = cacos(z);
printf("cacos() = %6.3f %6.3f*i\n", creal(c), cimag(c));
f = −i * clog(z + i * csqrt(1 − z * z));
printf("formula = %6.3f %6.3f*i\n", creal(f), cimag(f));
exit(EXIT_SUCCESS);
}
ccos(3), clog(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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cacos(3) | |