The JavaScript Source: Math Related: Function Grapher

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Function Grapher

Graphs any function you enter on the scale of your choice, assuming you use the correct JavaScript syntax. For example, to use Cos x, use Math.cos(x). Or, for x^2, use Math.pow(x, 2), etc.

The JavaScript Source: Math Related: Function Grapher (Function Page)
Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s). The script is yours!!!


  <HEAD> <SCRIPT LANGUAGE="JavaScript">      </script> </HEAD>  <BODY> <center> <form> <table border=0 bgcolor="#E6E6E6" cellpadding=3 cellspacing=0> <tr> <td colspan=2> <font face="Arial" size="2">Function (JavaScript syntax)<br> <input type=text name=graph size=20 maxlength=40 value="Math.cos(x)"> <p> <td rowspan=2 valign=middle align=center> <input type=button value="Plot" name=Plot onClick="drawGraph(this.form)"> </td> </tr> <tr> <td nowrap> <font face="Arial" size="2">X min<br> <input type=text name=minX size=4 maxlength=3 value="-10"> </font> </td> <td nowrap> <font face="Arial" size="2">X max<br> <input type=text name=maxX size=3 maxlength=3 value="10"> </font> </td> </tr> </table> </form> </center> 
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The JavaScript Source: Math Related: Function Grapher (Draw Graph Page)
Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s). The script is yours!!!


  <html> <head> </head> <style> .point { position: absolute; } </style> <script> function getParams() { var idx = document.URL.indexOf('?'); var params = new Array(); if (idx != -1) { var pairs = document.URL.substring(idx+1, document.URL.length).split('&'); for (var i=0; i<pairs.length; i++) { nameVal = pairs[i].split('='); params[nameVal[0]] = nameVal[1]; } } return params; } dotCode = '<div class="point" id="pdot_id"><img src="graph.gif" width="1" height="pic_height" alt="pic_alt"></div>\n'; xCode = '<div class="point" id="xAxis"><table border="0" width="x_width" cellspacing="0" cellpadding="0"><tr><td width="100%" bgcolor="#000000"><img src="espace.gif" width="1" height="1"></td></tr></table></div>\n'; yCode = '<div class="point" id="yAxis"><table border="0" height="y_height" cellspacing="0" cellpadding="0"><tr><td width="100%" bgcolor="#000000"><img src="espace.gif" width="1" height="1"></td></tr></table></div>\n'; backCode = '<div class="point" id="background"><table border="0" height="back_height" width="back_width" cellspacing="0" cellpadding="0"><tr><td width="100%" bgcolor="#EEEEEE"> </td></tr></table></div>\n'; if (navigator.appName == 'Netscape') { leftCode = 'document.obj_id.left = '; topCode = 'document.obj_id.top = '; } else { leftCode = 'document.all.obj_id.style.left = '; topCode = 'document.all.obj_id.style.top = '; } params = getParams(); fct = unescape(params["graph"]); xMin = parseFloat(params["minX"]); xMax = parseFloat(params["maxX"]); nbXs =200; nbYs = 200; maxYpos = 225; minXpos = 25; x = xMin; yZero = Math.abs(eval(fct)); yMax = yZero; yMin = yZero; datas = new Array(); deltaX = (xMax - xMin) / nbXs; i = 0; while (x <= xMax) { y = eval(fct); datas[i] = x + ':' + y; yMax = Math.max(y, yMax); yMin = Math.min(y, yMin); yZero = Math.min(yZero, Math.abs(y)) x+= deltaX; i++; } deltaY = nbYs / (yMax - yMin); yPos = new Array(); for (i=0; i<datas.length; i++) { yPos[i] = maxYpos - (((datas[i].split(':'))[1] - yMin) * deltaY); } document.write(backCode.replace(/back_width/, nbXs).replace(/back_height/, nbYs)); eval(leftCode.replace(/obj_id/, 'background') + minXpos); eval(topCode.replace(/obj_id/, 'background') + (maxYpos - nbYs)); if ((xMin * xMax) < 0) { document.write(yCode.replace(/y_height/, nbXs)); eval(leftCode.replace(/obj_id/, 'yAxis') + (minXpos - (xMin * (nbXs/(xMax - xMin))))); eval(topCode.replace(/obj_id/, 'yAxis') + (maxYpos - nbYs)); } if ((yMin * yMax) <= 0) { document.write(xCode.replace(/x_width/, nbYs)); eval(leftCode.replace(/obj_id/, 'xAxis') + minXpos); eval(topCode.replace(/obj_id/, 'xAxis') + (maxYpos - ((yZero - yMin) * deltaY))); } for (i=1; i<(datas.length-1); i++) { picHeight = Math.abs((yPos[i-1] - yPos[i]) + (yPos[i] - yPos[i+1])) / 2; YDPos = yPos[i] - (Math.round(picHeight) / 2); document.write(dotCode.replace(/dot_id/, i).replace(/pic_height/, Math.ceil(picHeight)).replace(/pic_alt/, datas[i])); eval(leftCode.replace(/obj_id/, 'p' + i) + (minXpos + i)); eval(topCode.replace(/obj_id/, 'p' + i) + YDPos); } </script> <body bgcolor="#FFFFFF"> </body> </html>  
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