CATAN(3P) POSIX Programmer's Manual CATAN(3P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
catan, catanf, catanl - complex arc tangent functions
double complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex z);
These functions shall compute the complex arc tangent of z, with branch
cuts outside the interval [-i, +i] along the imaginary axis.
These functions shall return the complex arc tangent value, in the
range of a strip mathematically unbounded along the imaginary axis and
in the interval [-pi/2, +pi/2] along the real axis.
No errors are defined.
The following sections are informative.
SEE ALSOctan(), the Base Definitions volume of IEEE Std 1003.1-2001, <com‐
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 CATAN(3P)