1CATAN(3P)                  POSIX Programmer's Manual                 CATAN(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       catan, catanf, catanl - complex arc tangent functions
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SYNOPSIS

15       #include <complex.h>
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17       double complex catan(double complex z);
18       float complex catanf(float complex z);
19       long double complex catanl(long double complex z);
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DESCRIPTION

23       These functions shall compute the complex arc tangent of z, with branch
24       cuts outside the interval [-i, +i] along the imaginary axis.
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RETURN VALUE

27       These  functions  shall  return  the  complex arc tangent value, in the
28       range of a strip mathematically unbounded along the imaginary axis  and
29       in the interval [-pi/2, +pi/2] along the real axis.
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ERRORS

32       No errors are defined.
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34       The following sections are informative.
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EXAMPLES

37       None.
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APPLICATION USAGE

40       None.
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RATIONALE

43       None.
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FUTURE DIRECTIONS

46       None.
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SEE ALSO

49       ctan(),  the  Base  Definitions  volume  of IEEE Std 1003.1-2001, <com‐
50       plex.h>
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53       Portions of this text are reprinted and reproduced in  electronic  form
54       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
55       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
56       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
57       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
58       event of any discrepancy between this version and the original IEEE and
59       The Open Group Standard, the original IEEE and The Open Group  Standard
60       is  the  referee document. The original Standard can be obtained online
61       at http://www.opengroup.org/unix/online.html .
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65IEEE/The Open Group                  2003                            CATAN(3P)
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