man3/cabs.3

   1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
   2 .\"
   3 .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
   4 .\" Distributed under GPL
   5 .\" %%%LICENSE_END
   6 .\"
   7 .TH CABS 3 2015-04-19 "" "Linux Programmer's Manual"
   8 .SH NAME
   9 cabs, cabsf, cabsl \- absolute value of a complex number
  10 .SH SYNOPSIS
  11 .B #include <complex.h>
  12 .PP
  13 .BI "double cabs(double complex " z );
  14 .br
  15 .BI "float cabsf(float complex " z );
  16 .br
  17 .BI "long double cabsl(long double complex " z );
  18 .PP
  19 Link with \fI\-lm\fP.
  20 .SH DESCRIPTION
  21 These functions return the absolute value of the complex number
  22 .IR z .
  23 The result is a real number.
  24 .SH VERSIONS
  25 These functions first appeared in glibc in version 2.1.
  26 .SH ATTRIBUTES
  27 For an explanation of the terms used in this section, see
  28 .BR attributes (7).
  29 .TS
  30 allbox;
  31 lbw24 lb lb
  32 l l l.
  33 Interface       Attribute       Value
  34 T{
  35 .BR cabs (),
  36 .BR cabsf (),
  37 .BR cabsl ()
  38 T}      Thread safety   MT-Safe
  39 .TE
  40 .SH CONFORMING TO
  41 C99, POSIX.1-2001, POSIX.1-2008.
  42 .SH NOTES
  43 The function is actually an alias for
  44 .I "hypot(a,\ b)"
  45 (or, equivalently,
  46 .IR "sqrt(a*a\ +\ b*b)" ).
  47 .SH SEE ALSO
  48 .BR abs (3),
  49 .BR cimag (3),
  50 .BR hypot (3),
  51 .BR complex (7)