Javascript: gamma approximation Post: 302876504

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Top Forums Programming Javascript: gamma approximation Post 302876504 by figaro on Monday 25th of November 2013 06:10:57 AM

11-25-2013

Registered User

Javascript: gamma approximation

Here is some javascript code that implements the Lanczos approximation to the gamma function (http://en.wikipedia.org/wiki/Lanczos_approximation):

Code:

<script type="text/javascript">
// Gamma approximation; coefficients used by the GNU Scientific Library
function gamma(z) {
  var p = [0.99999999999980993, 676.5203681218851, -1259.1392167224028, 771.32342877765313, -176.61502916214059, 12.507343278686905, -0.13857109526572012, 9.9843695780195716e-6, 1.5056327351493116e-7];
  if z < 0.5 {
     return Math.PI / (Math.sin(Math.PI*z) * gamma(1-z));
  } else {
    z -= 1;
    x = p[0];
    for (var i = 0; i < p.length; i++) x += p[i]/(z+i);
    t = z + p.length - 1.5;
    return Math.sqrt(2*Math.PI) * Math.pow(t, z+0.5) * Math.exp(-t) * x;
  }
}

for (var x = 0.1; x < 3; x += 0.1) document.write("x: " + x + " gamma(x): " + gamma(x) + "<br/>");
</script>

This returns an empty page, which usually means there is a syntactical error in the code. In the absence of a proper debugger, can anyone point out where this error might be?

Thank you in advance.

figaro

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perl::critic::utils::mccabe

Perl::Critic::Utils::McCabe(3)				User Contributed Perl Documentation			    Perl::Critic::Utils::McCabe(3)

NAME

       Perl::Critic::Utils::McCabe - Functions that calculate the McCabe score of source code.

DESCRIPTION

       Provides approximations of McCabe scores.  The McCabe score of a set of code describes the number of possible paths through it.	The
       functions here approximate the McCabe score by summing the number of conditional statements and operators within a set of code.	See
       <http://en.wikipedia.org/wiki/Cyclomatic_complexity> for some discussion about the McCabe number and other complexity metrics.

INTERFACE SUPPORT

       This is considered to be a public module.  Any changes to its interface will go through a deprecation cycle.

IMPORTABLE SUBS

       "calculate_mccabe_of_sub( $sub )"
	   Calculates an approximation of the McCabe number of the code in a PPI::Statement::Sub.

       "calculate_mccabe_of_main( $doc )"
	   Calculates an approximation of the McCabe number of all the code in a PPI::Statement::Document that is not contained in a subroutine.

AUTHOR

       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

COPYRIGHT

       Copyright (c) 2005-2011 Imaginative Software Systems.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.16.3							    2014-06-09					    Perl::Critic::Utils::McCabe(3)