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 CARG 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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carg, cargf, cargl \- calculate the argument
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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 carg(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 cargf(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 cargl(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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A complex number can be described by two real coordinates.
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One may use rectangular coordinates and gets z = x+I*y, where
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x = creal(z) and y = cimag(z).
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.LP
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Or one may use polar coordinates and gets z = r*cexp(I*a)
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where r = cabs(z) is the "radius", the "modulus", the absolute value of z,
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and a = carg(z) is the "phase angle", the argument of z.
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.LP
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2005-09-21 10:45:03 +00:00
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One has tan(carg(z)) = cimag(z) / creal(z).
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2004-11-03 13:51:07 +00:00
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.SH "RETURN VALUE"
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2005-07-07 08:27:03 +00:00
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The return value is the range of [\-pi,pi].
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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 cabs (3),
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2006-04-21 01:24:06 +00:00
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.BR complex (7)
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