FABS man page on Archlinux

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FABS(3P)		   POSIX Programmer's Manual		      FABS(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       fabs, fabsf, fabsl — absolute value function

       #include <math.h>

       double fabs(double x);
       float fabsf(float x);
       long double fabsl(long double x);

       The functionality described on this reference page is aligned with  the
       ISO C  standard.	 Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       defers to the ISO C standard.

       These  functions	 shall	compute	 the  absolute value of their argument

       Upon successful completion, these functions shall return	 the  absolute
       value of x.

       If x is NaN, a NaN shall be returned.

       If x is ±0, +0 shall be returned.

       If x is ±Inf, +Inf shall be returned.

       No errors are defined.

       The following sections are informative.

   Computing the 1-Norm of a Floating-Point Vector
       This  example shows the use of fabs() to compute the 1-norm of a vector
       defined as follows:

	   norm1(v) = |v[0]| + |v[1]| + ... + |v[n−1]|

       where |x| denotes the absolute value  of	 x,  n	denotes	 the  vector's
       dimension v[i] denotes the i-th component of v (0≤i<n).

	   #include <math.h>

	   norm1(const double v[], const int n)
	       int     i;
	       double  n1_v;  /* 1-norm of v */

	       n1_v = 0;
	       for (i=0; i<n; i++) {
		   n1_v += fabs (v[i]);

	       return n1_v;





       The Base Definitions volume of POSIX.1‐2008, <math.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			      FABS(3P)

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