man3/clog10.3

   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 CLOG10 3 2017-09-15 "" "Linux Programmer's Manual"
   8 .SH NAME
   9 clog10, clog10f, clog10l \- base-10 logarithm of a complex number
  10 .SH SYNOPSIS
  11 .BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
  12 .br
  13 .B #include <complex.h>
  14 .PP
  15 .BI "double complex clog10(double complex " z );
  16 .br
  17 .BI "float complex clog10f(float complex " z );
  18 .br
  19 .BI "long double complex clog10l(long double complex " z );
  20 .PP
  21 Link with \fI\-lm\fP.
  22 .SH DESCRIPTION
  23 The call
  24 .I clog10(z)
  25 is equivalent to:
  26 .PP
  27     clog(z)/log(10)
  28 .PP
  29 or equally:
  30 .PP
  31     log10(cabs(c)) + I * carg(c) / log(10)
  32 .PP
  33 The other functions perform the same task for
  34 .I float
  35 and
  36 .IR "long double" .
  37 .PP
  38 Note that
  39 .I z
  40 close to zero will cause an overflow.
  41 .SH VERSIONS
  42 These functions first appeared in glibc in version 2.1.
  43 .SH ATTRIBUTES
  44 For an explanation of the terms used in this section, see
  45 .BR attributes (7).
  46 .TS
  47 allbox;
  48 lbw30 lb lb
  49 l l l.
  50 Interface       Attribute       Value
  51 T{
  52 .BR clog10 (),
  53 .BR clog10f (),
  54 .BR clog10l ()
  55 T}      Thread safety   MT-Safe
  56 .TE
  57 .SH CONFORMING TO
  58 These functions are GNU extensions.
  59 The identifiers are reserved for future use in C99 and C11.
  60 .SH SEE ALSO
  61 .BR cabs (3),
  62 .BR cexp (3),
  63 .BR clog (3),
  64 .BR clog2 (3),
  65 .BR complex (7)