'\" t .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) .\" .\" SPDX-License-Identifier: GPL-1.0-or-later .\" .TH conj 3 2023-07-20 "Linux man-pages 6.05.01" .SH NAME conj, conjf, conjl \- calculate the complex conjugate .SH LIBRARY Math library .RI ( libm ", " \-lm ) .SH SYNOPSIS .nf .B #include .PP .BI "double complex conj(double complex " z ); .BI "float complex conjf(float complex " z ); .BI "long double complex conjl(long double complex " z ); .fi .SH DESCRIPTION These functions return the complex conjugate value of .IR z . That is the value obtained by changing the sign of the imaginary part. .PP One has: .PP .in +4n .EX cabs(z) = csqrt(z * conj(z)) .EE .in .SH ATTRIBUTES For an explanation of the terms used in this section, see .BR attributes (7). .TS allbox; lbx lb lb l l l. Interface Attribute Value T{ .na .nh .BR conj (), .BR conjf (), .BR conjl () T} Thread safety MT-Safe .TE .sp 1 .SH STANDARDS C11, POSIX.1-2008. .SH HISTORY glibc 2.1. C99, POSIX.1-2001. .SH SEE ALSO .BR cabs (3), .BR csqrt (3), .BR complex (7)