Function Math.logN

Compute the logarithm of a number using any base.

• Syntax Number Math.logN(Number x , Number b )
  
  This function lets you compute the logarithm of any number x using base b. If the base is 2 or 10 then the JavaScript constants Math.LOG2E and Math.LOG10E are used for better precision.
• Parameters

  Number x

  The number you wish to calculate the logarithm of.

  Number b

  The base of the logarithm

• Return value The logarithm of x using base b
• Examples

  To compute the logarithm of 1000 using base 10

  // Output 3
  Math.logN(1000,10);

• Download
  Download this function including dependencies
  Source

  Unless otherwise noted all code in the JSLab Standard Library is licensed as GPLv3. See http://www.gnu.org/licenses/gpl.html for the entire license.

  // ************************************************************************** // Copyright 2007 - 2009 Tavs Dokkedahl // Contact: http://www.jslab.dk/contact.php // // This file is part of the JSLab Standard Library (JSL) Program. // // JSL is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3 of the License, or // any later version. // // JSL is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. // *************************************************************************** // Return the logarithm of n using base b function logN(x,b) { if (b == 2) return Math.LOG2E * Math.log(x); if (b == 10) return Math.LOG10E * Math.log(x); return Math.log(x) / Math.log(b); };