.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
+.\" and Copyright (C) 2011 Michael Kerrisk <mtk.manpages@gamil.com>
+.\"
+.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
.\" Distributed under GPL
+.\" %%%LICENSE_END
.\"
-.TH CATANH 3 2008-08-11 "" "Linux Programmer's Manual"
+.TH CATANH 3 2011-09-15 "" "Linux Programmer's Manual"
.SH NAME
catanh, catanhf, catanhl \- complex arc tangents hyperbolic
.SH SYNOPSIS
One has:
.nf
- catanh(z) = 0.5 * clog((1 + z) / (1 \- z))
+ catanh(z) = 0.5 * (clog(1 + z) \- clog(1 \- z))
.fi
.SH VERSIONS
These functions first appeared in glibc in version 2.1.
-.SH "CONFORMING TO"
+.SH CONFORMING TO
C99.
-.SH "SEE ALSO"
+.SH EXAMPLE
+.nf
+/* 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);
+}
+.fi
+.SH SEE ALSO
.BR atanh (3),
.BR cabs (3),
.BR cimag (3),
+.BR ctanh (3),
.BR complex (7)
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.