GENWiki

Premier IT Outsourcing and Support Services within the UK

User Tools

Site Tools


man:cacosh

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

NAME

     cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine

SYNOPSIS

     #include <complex.h>
     double complex cacosh(double complex z);
     float complex cacoshf(float complex z);
     long double complex cacoshl(long double complex z);
     Link with -lm.

DESCRIPTION

     These  functions  calculate the complex arc hyperbolic cosine of z.  If
     y = cacosh(z), then z = ccosh(y).  The imaginary part of y is chosen in
     the interval [-pi,pi].  The real part of y is chosen nonnegative.
     One has:
         cacosh(z) = 2 * clog(csqrt((z + 1) / 2) + csqrt((z - 1) / 2))

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).
     +-------------------------------+---------------+---------+
     |Interface                      | Attribute     | Value   |
     +-------------------------------+---------------+---------+
     |cacosh(), cacoshf(), cacoshl() | 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 = cacosh(z);
         printf("cacosh() = %6.3f %6.3f*i\n", creal(c), cimag(c));
         f = 2 * clog(csqrt((z + 1)/2) + csqrt((z - 1)/2));
         printf("formula  = %6.3f %6.3f*i\n", creal(f2), cimag(f2));
         exit(EXIT_SUCCESS); }

SEE ALSO

     acosh(3), cabs(3), ccosh(3), cimag(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                         CACOSH(3)
/data/webs/external/dokuwiki/data/pages/man/cacosh.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

Was this page helpful?-10+1

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki