Javascript Array Based Sine and Cosine Lookup Tables
I'm currently playing around with Raphael JS and decided to speed up some sine and cosine calculations through use of lookup tables.
Common-sense dictates that google will typically know a solution to simple programming tasks and can direct you to a cornucopia of code samples, however I wasn't able to quickly find any cosine/sine lookup tables specifically for Javascript. This may be because they are trivially easy to generate, but the inclination to google, copy and paste grows stronger every day.
In keeping with the spirit of google, copy and paste, here are the lookup tables I generated. They are in the form of javascript arrays, representing the cosine and sine values from 0 degrees through 360, the index of the array correlating to the degree in question, e.g. cosineTable[45] represents the value of Math.cos(45) or 0.5253219888177297 and cosineRadTable[45] represents the value of Math.cos(Raphael.rad(45)) or the cosine of 45 degrees converted to radians: 0.7071067811865476
The code utilized to generate these tables (Requires Raphael.js for degree conversion to radians):
var cosineRadianArray = []; var sineRadianArray = []; var cosineArray = []; var sineArray = []; for(i = 0; i <= 360; i++) { cosineArray[i] = Math.cos(i); cosineRadianArray[i] = Math.cos(Raphael.rad(i)); sineArray[i] = Math.sin(i); sineRadianArray[i] = Math.sin(Raphael.rad(i)); } console.log(cosineArray); console.log(sineArray); console.log(cosineRadianArray); console.log(sineRadianArray);
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