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function  

acos

 
 

Library: Trigonometry (OMTRIG)
Import: omtrig.xmd
Return type: opaque

Returns: The arc cosine of the floating point value.


Declaration

export external float function
     acos value float x


Purpose

A trigonometric function that calculates, in radians, the arc cosine (inverse cosine) of a floating point number. This function works the same way as its equivalent in the C math library.

Out-of-range values, (|x| > 1), return "not a number" (NaN).

Example:


  import "omtrig.xmd" unprefixed
  import "omfloat.xmd" unprefixed
  process
     local float x initial {0.567}
     local float acos-value
     set acos-value to acos x
     output "Arc cosine of x, where x = " 
         || "d" % x 
         || ", is "
         || "d" % acos-value
         || "%n"
  ; Output: "Arc cosine of x, where x = 0.567, is 0.967937080405776"
   

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OmniMark 9.1.0 Documentation Generated: September 2, 2010 at 1:38:10 pm
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