Unix/Linux Go Back    


Linux 2.6 - man page for sin (linux section 3posix)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


SIN(P)				    POSIX Programmer's Manual				   SIN(P)

NAME
       sin, sinf, sinl - sine function

SYNOPSIS
       #include <math.h>

       double sin(double x);
       float sinf(float x);
       long double sinl(long double x);

DESCRIPTION
       These functions shall compute the sine of their argument x, measured in radians.

       An  application	wishing  to  check for error situations should set errno to zero and call
       feclearexcept(FE_ALL_EXCEPT) before calling these functions.  On return, if errno is  non-
       zero  or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero,
       an error has occurred.

RETURN VALUE
       Upon successful completion, these functions shall return the sine of x.

       If x is NaN, a NaN shall be returned.

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

       If x is subnormal, a range error may occur and x should be returned.

       If x is +-Inf, a domain error shall occur, and either a NaN (if supported), or  an  imple-
       mentation-defined value shall be returned.

ERRORS
       These functions shall fail if:

       Domain Error
	      The x argument is +-Inf.

       If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be
       set to [EDOM]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is	non-zero,
       then the invalid floating-point exception shall be raised.

       These functions may fail if:

       Range Error
	      The value of x is subnormal

       If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be
       set to [ERANGE]. If the integer expression (math_errhandling  &	MATH_ERREXCEPT)  is  non-
       zero, then the underflow floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES
   Taking the Sine of a 45-Degree Angle
	      #include <math.h>
	      ...
	      double radians = 45.0 * M_PI / 180;
	      double result;
	      ...
	      result = sin(radians);

APPLICATION USAGE
       These  functions  may lose accuracy when their argument is near a multiple of pi or is far
       from 0.0.

       On  error,  the	expressions  (math_errhandling	&  MATH_ERRNO)	and  (math_errhandling	&
       MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       asin()  ,  feclearexcept()  ,  fetestexcept()  ,  isnan() , the Base Definitions volume of
       IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for  Mathematical  Func-
       tions, <math.h>

COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					   SIN(P)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 12:12 PM.