mirror of https://github.com/mkerrisk/man-pages
70 lines
1.4 KiB
Groff
70 lines
1.4 KiB
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" Distributed under GPL
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.\" %%%LICENSE_END
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.\"
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.TH CLOG10 3 2021-03-22 "" "Linux Programmer's Manual"
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.SH NAME
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clog10, clog10f, clog10l \- base-10 logarithm of a complex number
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.SH SYNOPSIS
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.nf
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.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
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.B #include <complex.h>
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.PP
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.BI "double complex clog10(double complex " z );
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.BI "float complex clog10f(float complex " z );
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.BI "long double complex clog10l(long double complex " z );
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.PP
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Link with \fI\-lm\fP.
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.fi
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.SH DESCRIPTION
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The call
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.I clog10(z)
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is equivalent to:
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.PP
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clog(z)/log(10)
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.PP
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or equally:
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.PP
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log10(cabs(c)) + I * carg(c) / log(10)
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.PP
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The other functions perform the same task for
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.I float
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and
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.IR "long double" .
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.PP
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Note that
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.I z
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close to zero will cause an overflow.
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.SH VERSIONS
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These functions first appeared in glibc in version 2.1.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR clog10 (),
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.BR clog10f (),
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.BR clog10l ()
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T} Thread safety MT-Safe
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.TE
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.hy
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.ad
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.sp 1
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.SH CONFORMING TO
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These functions are GNU extensions.
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The identifiers are reserved for future use in C99 and C11.
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.SH SEE ALSO
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.BR cabs (3),
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.BR cexp (3),
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.BR clog (3),
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.BR clog2 (3),
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.BR complex (7)
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