man3/conj.3

   1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
   2 .\"
   3 .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
   4 .\" Distributed under GPL
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   6 .\"
   7 .TH CONJ 3 2015-04-19 "" "Linux Programmer's Manual"
   8 .SH NAME
   9 conj, conjf, conjl \- calculate the complex conjugate
  10 .SH SYNOPSIS
  11 .B #include <complex.h>
  12 .PP
  13 .BI "double complex conj(double complex " z );
  14 .br
  15 .BI "float complex conjf(float complex " z );
  16 .br
  17 .BI "long double complex conjl(long double complex " z );
  18 .PP
  19 Link with \fI\-lm\fP.
  20 .SH DESCRIPTION
  21 These functions return the complex conjugate value of
  22 .IR z .
  23 That is the value obtained by changing the sign of the imaginary part.
  24 .LP
  25 One has:
  26 .nf
  27
  28     cabs(z) = csqrt(z * conj(z))
  29 .fi
  30 .SH VERSIONS
  31 These functions first appeared in glibc in version 2.1.
  32 .SH ATTRIBUTES
  33 For an explanation of the terms used in this section, see
  34 .BR attributes (7).
  35 .TS
  36 allbox;
  37 lbw24 lb lb
  38 l l l.
  39 Interface       Attribute       Value
  40 T{
  41 .BR conj (),
  42 .BR conjf (),
  43 .BR conjl ()
  44 T}      Thread safety   MT-Safe
  45 .TE
  46 .SH CONFORMING TO
  47 C99, POSIX.1-2001, POSIX.1-2008.
  48 .SH SEE ALSO
  49 .BR cabs (3),
  50 .BR csqrt (3),
  51 .BR complex (7)