Get Previous Close Without Reload??

[danpaul]

I have written some studies that are based on a symbols change in value from the previous day's close. Currently, the value is based on the close at the time the study is loaded, and each day it has to be reloaded after the open to get the correct value.

The code in main that sets the variable of the Nasdaq is:

var vCOMPQ = close("$COMPQ") - getValueAbsolute("close", -1, "$COMPQ,D");

What do i need to change or add in order for the value to be automatically updated each day.

Thanks,

Dan

[eSignal_JasonK]

Hello Dan,

What you need to do is synchronize the index value used in your getValueAbsolute() call using getPreviousTradingDay() and getFirstBarIndexOfDay(). The formula, getPrevOHLC1.efs, will handle this for you. Download this formula to your \eSignal\Formulas\OHLC folder and then use it with callFunction() like in the example below.

function main() {
    var vC = callFunction("/OHLC/getPrevOHLC1.efs", "main", "Close", "$COMPQ");
    if (vC == null) return;
    
    return vC;
} 

The modification to your code example looks something like this.

function main() {
    var vC = callFunction("/OHLC/getPrevOHLC1.efs", "main", "Close", "$COMPQ");
    if (vC == null) return;
    
    var vCOMPQ = close("$COMPQ") - vC;
    return vCOMPQ;
} 

Try this out and let me know if it works for you.

[danpaul]

Jason,

Thanks, it seemed to work fine today on
4 different formula. I sent copies to a few
friends to test at tomorrow's open.

Thanks again, you made this quite easy
for me.

Dan