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man:catanhf

CATANH(3) Linux Programmer's Manual CATANH(3)

NAME

     catanh, catanhf, catanhl - complex arc tangents hyperbolic

SYNOPSIS

     #include <complex.h>
     double complex catanh(double complex z);
     float complex catanhf(float complex z);
     long double complex catanhl(long double complex z);
     Link with -lm.

DESCRIPTION

     These  functions calculate the complex arc hyperbolic tangent of z.  If
     y = catanh(z), then z = ctanh(y).  The imaginary part of y is chosen in
     the interval [-pi/2,pi/2].
     One has:
         catanh(z) = 0.5 * (clog(1 + z) - clog(1 - z))

VERSIONS

     These functions first appeared in glibc in version 2.1.

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).
     allbox; lbw30 lb lb l  l  l.   Interface Attribute Value  T{  catanh(),
     catanhf(), catanhl() T}   Thread safety  MT-Safe

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.

EXAMPLE

     /* 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;
         if (argc != 3) {
             fprintf(stderr, "Usage: %s <real> <imag>\n", argv[0]);
             exit(EXIT_FAILURE);
         }
         z = atof(argv[1]) + atof(argv[2]) * I;
         c = catanh(z);
         printf("catanh() = %6.3f %6.3f*i\n", creal(c), cimag(c));
         f = 0.5 * (clog(1 + z) - clog(1 - z));
         printf("formula  = %6.3f %6.3f*i\n", creal(f2), cimag(f2));
         exit(EXIT_SUCCESS); }

SEE ALSO

     atanh(3), cabs(3), cimag(3), ctanh(3), complex(7)

COLOPHON

     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.
                                2015-04-19                         CATANH(3)
/data/webs/external/dokuwiki/data/pages/man/catanhf.txt · Last modified: 2019/05/17 09:32 by 127.0.0.1

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