var timeIntr; var load; var chaos; var val; var ite; var i; var j; var k; var currItrn = new Array(); var prevItrn = new Array(); var freqVal = new Array(); function roundOff(val) { //Round-off to 2 decimal places var len; var ans; ans = val * 1000; ans = Math.round(ans /10) + ""; while (ans.length < 3) { ans = "0" + ans; } len = ans.length; val = ans.substring(0,len-2) + "." + ans.substring(len-2,len); return val; } function frqDist(power) { //Frequency distribution var loop; loop = 0; ite = ite+1; i = 0; j = 0; while (loop <= (ite-2)) { if (loop != (ite-2)) { prevItrn[j+1] = currItrn[i+1]; currItrn[++i] = prevItrn[j] + prevItrn[++j]; if((ite-1) == power) { freqVal[k++] = currItrn[i]; } } else { currItrn[++i] = 1; if((ite-1) == power) { freqVal[k++] = currItrn[i]; } } loop = loop + 1; } } function formValidate() { var durtnHr; var durtnMn; var durtnSe; var firstCh = 0; timeIntr=0; var n; //Validation of duration n = document.selfsimilar.durationhr.selectedIndex; // Which menu item is selected durtnHr = document.selfsimilar.durationhr[n].text; // Return string value of menu item n = document.selfsimilar.durationmn.selectedIndex; durtnMn = document.selfsimilar.durationmn[n].text; n = document.selfsimilar.durationse.selectedIndex; durtnSe = document.selfsimilar.durationse[n].text; timeIntr=(parseFloat(durtnHr)*60*60) + (parseFloat(durtnMn)*60) + parseFloat(durtnSe); if (timeIntr==0) { alert("Select the duration"); return false; } //Validation of load load = document.selfsimilar.load.value; firstCh = document.forms[0].elements[3].value.charAt(0); if( firstCh == "-" || isNaN(load) || (load==null) || (load=="") || firstCh == 0) { alert("Enter a positive integer value for load"); document.forms[0].elements[3].value = ""; document.forms[0].elements[3].focus(); return false; } //Validation of chaos chaos = document.selfsimilar.chaos.value; if (chaos < 0.5 || chaos > 1) { alert("Enter a value between 0.5 and 1 for Chaos factor"); document.forms[0].elements[4].value = ""; document.forms[0].elements[4].focus(); return false; } calc(timeIntr,load,chaos) } function calc(timeIntr,load,chaos) { var prevTimeIntr; var power; var currPwr; var prevPwr; var totfreq; var val; var tempHitVal = new Array(); var hitVal = new Array(); var freq = new Array(); var prob = new Array(); var cdf = new Array(); var content; //Open a new window to display the results var newWindow = window.open("","","status,scrollbars=yes,height=300,width=410"); newWindow.document.write("Self-Similar Traffic Generator "); newWindow.document.write("

Self-Similar Traffic Generator Results


") ; //Display the input in result window newWindow.document.write(" Duration: " + timeIntr + "
") ; newWindow.document.write("Load: " + load + "
"); newWindow.document.write("Chaos Factor: " + chaos + "

"); prevTimeIntr = parseInt(timeIntr); power = 0; //Calculate power while (timeIntr > Math.pow(2,power)) { power = power + 1; } //Check whether duration is power of 2....if not,make it to nearest power of 2 currPwr = Math.abs(Math.pow(2,power) - parseInt(timeIntr)); prevPwr = Math.abs(Math.pow(2,(power-1)) - parseInt(timeIntr)); if(currPwr < prevPwr) { timeIntr = parseInt(Math.pow(2,power)); } else { timeIntr = parseInt(Math.pow(2,(power-1))); power = power-1; } //Increase hit value proportionally if (timeIntr != prevTimeIntr) { load = parseFloat(load) * (timeIntr/prevTimeIntr); } newWindow.document.write("
"); //Generate freq. distribution ite = 1; i = 0; j = 0; k = 0; currItrn[1] = 1; prevItrn[0] = 1; prevItrn[1] = 1; freqVal[k++] = 1; while (timeIntr > 1) { frqDist(power); timeIntr = timeIntr / 2; } //Calculate hit value and round-off hit value to 2 decimal places len = 0; ans = 0; i = 0; while (i <= power) { val = load * (Math.pow(chaos,(power-i))) * (Math.pow((1-chaos),i)); tempHitVal[i] = roundOff(val); i = i+1; } //If 2 consecutive hit values are same then add their freq.s i = power; k = 0; hitVal[0] = tempHitVal[i]; freq[0] = freqVal[i]; while (i <= power && i > 0) { if (tempHitVal[i] == tempHitVal[i-1]) { freqVal[i-1] = freqVal[i] + freqVal[i-1]; freq[k] = freqVal[i-1]; hitVal[k] = tempHitVal[i-1]; } else //Else donot add freq.s { k = k+1; freq[k] = freqVal[i-1]; hitVal[k] = tempHitVal[i-1]; } i = i-1; } //Calculate total frequency totfreq = 0; i = 0; while (i <= k) { totfreq = totfreq+freq[i]; i = i+1; } //Calculate probability and percentile..expressed in terms of % & rounded-off to 2 decimal places i = 0; cdf[i-1] = 0; while (i <= k) { val = (freq[i]/totfreq) * 100; prob[i] = roundOff(val); val = parseFloat(prob[i]) + parseFloat(cdf[i-1]); cdf[i] = roundOff(val); if(i == k) { cdf[i] = Math.round(cdf[i]); } i = i+1; } //Create a table to display the values content = "
"; content += ""; //Enter table data i = 0; while (i <= k) { content += ""; content += "" ; content += ""; content += ""; content += ""; i = i+1; } content += "
Hit Value Frequency Probability (%)   Percentile (%)   
" + hitVal[i] + "" + freq[i]+ "" + prob[i] + "" + cdf[i] + "


"; newWindow.document.write(content); }