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PeriodHighLow Tradestation indicator Help

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Preface this with I am a newbie at Tradestation development. I am trying to write some simple indicators and then grow from there, and I am needing some assistance with the seasoned professionals could lend some help.


I have an basic indicator I am working on, that will calculate the highest high, or lowest low within a given time frame. I have the following:


Inputs:    Starttime (0800),
        EndTime ( 1000);
Vars:    PeriodHigh(0),
        LastPeriodHigh (0),
        LastPeriodLow (999999);
If T >= Starttime and T <= EndTime then
    If H > PeriodHigh then PeriodHigh = H;
    If L < PeriodLow then PeriodLow = L;

Plot1 (LastPeriodHigh);

However it appears when i apply the indicator to the chart, it is plotting the session high and low, but NOT from the range of times i am using... Not sure why?


if anyone could help out, and explain what I might be missing here.




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