upperDonchian

[cashcarewins]

I apply the following script to a chart of type $tick,1

function preMain() {
    setStudyTitle("MikeTest");
}

var upD = null;
var lowD = null;
var count = 0;

function main() 
{
var tempref = ref(-1);
    if (count == 0)
    {
        count++;
        upD = upperDonchian(3, "high", sym("ES #F, 1"));
        lowD = lowerDonchian(3, "low", sym("ES #F, 1"));
    }

    if (getBarState() == BARSTATE_NEWBAR)
    {
        debugPrintln("upd: " + upD.getValue(0) + " lowD: " + lowD.getValue(0));
    }
} 

I am returned with the 3 period channel for $tick, not es #f. Any help is appreciated, this is a neat feature.

[eSignal_JasonK]

Hello cashcarewins,

You were not using proper parameters for the built-in Donchian functions. The source parameter needs to be a data series function such as high() vs. a string of "high". This is one of the main differences between the built-in studies from EFS1 vs. EFS2. You were also passing the sym() function for the bar index parameter. The second parameter can be another data source, sym(), inv(), or a combination of these three things as a single parameter. The third bar index parameter is expected to be a number. So to get the high of ES #F for the data source you would pass sym("ES #F, 1") to the high() data series (i.e high(sym("ES #F, 1")) ). The way your code was set up was forcing the function to use default values because it didn't recognize your optional parameters. This is why it was returning values for $Tick. Try the modified code below.

function preMain() {
    setStudyTitle("MikeTest");
}

var upD = null;
var lowD = null;
var count = 0;

function main() {
    var tempref = ref(-1);

    if (upD == null) upD = upperDonchian(3, high(sym("ES #F, 1")));
    if (lowD == null) lowD = lowerDonchian(3, low(sym("ES #F, 1")));
    
    if (count == 0) {
        count++;
    }

    if (getBarState() == BARSTATE_NEWBAR) {
        debugPrintln("upd: " + upD.getValue(0) + " lowD: " + lowD.getValue(0));
    }
    
    return new Array(getSeries(upD), getSeries(lowD));
}