mirror of https://github.com/mkerrisk/man-pages
30 lines
771 B
Groff
30 lines
771 B
Groff
.\" 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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.TH CATANH 3 2002-07-28 "" "complex math routines"
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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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.BI "double complex catanh(double complex " z );
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.br
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.BI "float complex catanhf(float complex " z );
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.br
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.BI "long double complex catanhl(long double complex " z );
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.sp
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Link with \-lm.
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.SH DESCRIPTION
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The catanh() function calculates the complex atanh().
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If y = catanh(z), then z = ctanh(y).
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The imaginary part of y is chosen in the interval [\-pi/2,pi/2].
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.LP
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One has catanh(z) = 0.5*clog((1+z)/(1\-z)).
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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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.BR complex (5)
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