No bars printing!

[wombat953]

Can someone pls tell me what I have done wrong here? I have no bars printing in my indicator pane!!! I do have the value RETURNed to my cursor window, however, but not a bar in the pane!
Thanks
GP
function preMain(){ setPriceStudy(false); setStudyTitle("Up/Dn Vol"); setCursorLabelName("Up/Dn Vol"); setDefaultBarFgColor(Color.green); setStudyMin(20); setStudyMax(299); addBand(100, PS_SOLID, 2, Color.black,"equalvolume"); var fp0 = new FunctionParameter("market", FunctionParameter.STRING); fp0.setName("Market"); fp0.addOption("NYSE"); fp0.addOption("NASDAQ"); fp0.setDefault("NYSE"); } var volRatio; function main(market){ if (market=="NYSE") {volRatio=((close("$UVOL")/close("$DVOL"))*100).toFixed(2);} else {volRatio=((close("$UVOLQ")/close("$DVOLQ"))*100).toFixed(2);} if (volRatio < 100) {setBarFgColor(Color.red,0);} return new Array (volRatio); }

[eSignal_JasonK]

Hello GP,

The .toFixed() method returns a string. If you return a string to the chart, the value will appear in the cursor window but will not be drawn on the chart. To convert your volRatio variable back to a number, just multiply the result by 1.

function preMain() { 
    setPriceStudy(false); 
    setStudyTitle("Up/Dn Vol"); 
    setCursorLabelName("Up/Dn Vol"); 
    setDefaultBarFgColor(Color.green); 
    setStudyMin(20); 
    setStudyMax(299); 
    addBand(100, PS_SOLID, 2, Color.black,"equalvolume"); 

    var fp0 = new FunctionParameter("market", FunctionParameter.STRING); 
    fp0.setName("Market"); 
    fp0.addOption("NYSE"); 
    fp0.addOption("NASDAQ"); 
    fp0.setDefault("NYSE"); 
} 

var volRatio; 

function main(market) {
    if (market == "NYSE") {
        volRatio = ((close("$UVOL")/close("$DVOL"))*100).toFixed(2)*1;
    } else {
        volRatio = ((close("$UVOLQ")/close("$DVOLQ"))*100).toFixed(2)*1;
    } 

    if (volRatio < 100) {
        setBarFgColor(Color.red,0);
    }

    return volRatio; 
} 

[wombat953]

Jason - as always, many thanks. Altho' I m not sure I can say that this is completely intuitive! However, it is indeed in the JAVA doco!
"The Number.prototype.toFixed method returns a string representing a Number object in fixed-point notation, rounded to the number of digits after the decimal point specified by fractionDigits."

I did run across some code - posted here recently as part of a long thread- regarding TICK/TICKI readings, and was baffled why the author also used the "*1". There is no "tofixed" in this code. Or is he just being extra careful?
Thanks
George
cT = close(0, 1, "$tick")*1;
var cTi = close(0, 1, "$ticki")*1;
var cTi_l = low(0, 1, "$ticki")*1;
var cTi_h = high(0, 1, "$ticki")*1;
if (cT == null || cTi == null || cTi_l == null || cTi_h == null) return;

[eSignal_JasonK]

Hello GP,

That's a little coding trick I use to convert the result of those calls to a number. The actual result of close(0, 1, "$tick") is an array of size 1. The proper way to return the result to the chart would be to reference the array number. For example, if you removed the *1, then instead of referencing cT throughout the formula, you would reference it as cT[0]. In the return statement at the end of main() you would then need to change cT to cT[0].

Here's another handy trick that's kind of related to the above example. Notice the +"" in the last return statement of the formula you're referring to? barH and barL are numbers, but I didn't want to return the value to the chart if sOption was "Hist." Adding the +"" to barH and barL converts those variables to strings, which allows the values to be displayed in the cursor window but not drawn on the chart.

[wombat953]

Jason - so you are saying that a string variable cannot - and will not - be returned to the chart in a separate pane, ever. And that this might be a desirable course of action, at some times.
What about string variables in the body of the chart proper (with the price data)?
Thanks
George

[eSignal_JasonK]

Hello George,

You get the same behavior for price studies.