man3/asinh.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
   2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
   3 .\"     <mtk.manpages@gmail.com>
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  27 .\" References consulted:
  28 .\"     Linux libc source code
  29 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  30 .\"     386BSD man pages
  31 .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
  32 .\" Modified 2002-07-27 by Walter Harms
  33 .\"     (walter.harms@informatik.uni-oldenburg.de)
  34 .\"
  35 .TH ASINH 3  2017-09-15 "GNU"  "Linux Programmer's Manual"
  36 .SH NAME
  37 asinh, asinhf, asinhl \- inverse hyperbolic sine function
  38 .SH SYNOPSIS
  39 .nf
  40 .B #include <math.h>
  41 .PP
  42 .BI "double asinh(double " x );
  43 .BI "float asinhf(float " x );
  44 .BI "long double asinhl(long double " x );
  45 .fi
  46 .PP
  47 Link with \fI\-lm\fP.
  48 .PP
  49 .in -4n
  50 Feature Test Macro Requirements for glibc (see
  51 .BR feature_test_macros (7)):
  52 .in
  53 .PP
  54 .ad l
  55 .BR asinh ():
  56 .RS 4
  57 _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
  58     || _XOPEN_SOURCE\ >=\ 500
  59 .\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
  60     || /* Since glibc 2.19: */ _DEFAULT_SOURCE
  61     || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
  62 .RE
  63 .PP
  64 .BR asinhf (),
  65 .BR asinhl ():
  66 .RS 4
  67 _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
  68     || /* Since glibc 2.19: */ _DEFAULT_SOURCE
  69     || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
  70 .RE
  71 .ad b
  72 .SH DESCRIPTION
  73 These functions calculate the inverse hyperbolic sine of
  74 .IR x ;
  75 that is the value whose hyperbolic sine is
  76 .IR x .
  77 .SH RETURN VALUE
  78 On success, these functions return the inverse hyperbolic sine of
  79 .IR x .
  80 .PP
  81 If
  82 .I x
  83 is a NaN, a NaN is returned.
  84 .PP
  85 If
  86 .I x
  87 is +0 (\-0), +0 (\-0) is returned.
  88 .PP
  89 If
  90 .I x
  91 is positive infinity (negative infinity),
  92 positive infinity (negative infinity) is returned.
  93 .\"
  94 .\" POSIX.1-2001 documents an optional range error for subnormal x;
  95 .\" glibc 2.8 does not do this.
  96 .SH ERRORS
  97 No errors occur.
  98 .SH ATTRIBUTES
  99 For an explanation of the terms used in this section, see
 100 .BR attributes (7).
 101 .TS
 102 allbox;
 103 lbw27 lb lb
 104 l l l.
 105 Interface       Attribute       Value
 106 T{
 107 .BR asinh (),
 108 .BR asinhf (),
 109 .BR asinhl ()
 110 T}      Thread safety   MT-Safe
 111 .TE
 112 .SH CONFORMING TO
 113 C99, POSIX.1-2001, POSIX.1-2008.
 114 .PP
 115 The variant returning
 116 .I double
 117 also conforms to
 118 SVr4, 4.3BSD.
 119 .SH SEE ALSO
 120 .BR acosh (3),
 121 .BR atanh (3),
 122 .BR casinh (3),
 123 .BR cosh (3),
 124 .BR sinh (3),
 125 .BR tanh (3)