2004-11-03 13:51:07 +00:00
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.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\" Distributed under GPL
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.\"
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2007-05-18 08:43:42 +00:00
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.TH CATANH 3 2002-07-28 "" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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catanh, catanhf, catanhl \- complex arc tangents hyperbolic
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.SH SYNOPSIS
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.B #include <complex.h>
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.sp
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2007-04-12 22:42:49 +00:00
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.BI "double complex catanh(double complex " z );
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2004-11-11 17:28:42 +00:00
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.br
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2004-11-03 13:51:07 +00:00
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.BI "float complex catanhf(float complex " z );
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2004-11-11 17:28:42 +00:00
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.br
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2004-11-03 13:51:07 +00:00
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.BI "long double complex catanhl(long double complex " z );
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.sp
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2007-07-21 05:25:03 +00:00
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Link with \fI\-lm\fP.
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2004-11-03 13:51:07 +00:00
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.SH DESCRIPTION
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2007-04-12 22:42:49 +00:00
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The
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.BR catanh ()
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2007-11-16 06:41:19 +00:00
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function calculates the complex atanh(3).
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2004-11-03 13:51:07 +00:00
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If y = catanh(z), then z = ctanh(y).
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2005-07-07 08:27:03 +00:00
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The imaginary part of y is chosen in the interval [\-pi/2,pi/2].
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2004-11-03 13:51:07 +00:00
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.LP
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2007-05-01 08:15:41 +00:00
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One has catanh(z) = 0.5 * clog((1 + z) / (1 \- z)).
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2004-11-03 13:51:07 +00:00
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.SH "CONFORMING TO"
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C99
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.SH "SEE ALSO"
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.BR atanh (3),
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.BR cabs (3),
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.BR cimag (3),
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2006-04-21 01:24:06 +00:00
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.BR complex (7)
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