mirror of https://github.com/mkerrisk/man-pages
30 lines
731 B
Groff
30 lines
731 B
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
|
|
.\" Distributed under GPL
|
|
.\"
|
|
.TH CATAN 3 2002-07-28 "" "complex math routines"
|
|
.SH NAME
|
|
catan, catanf, catanl \- complex arc tangents
|
|
.SH SYNOPSIS
|
|
.B #include <complex.h>
|
|
.sp
|
|
.BI "double complex catan(double complex " z );
|
|
.br
|
|
.BI "float complex catanf(float complex " z );
|
|
.br
|
|
.BI "long double complex catanl(long double complex " z );
|
|
.sp
|
|
Link with \-lm.
|
|
.SH DESCRIPTION
|
|
The catan() function calculates the complex atan().
|
|
If y = catan(z), then z = ctan(y).
|
|
The real part of y is chosen in the interval [-pi/2,pi/2].
|
|
.LP
|
|
One has
|
|
catan(z) = 1/2i clog((1+iz)/(1-iz)).
|
|
.SH "CONFORMING TO"
|
|
C99
|
|
.SH "SEE ALSO"
|
|
.BR ccos (3),
|
|
.BR clog (3),
|
|
.BR complex (5)
|