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pine script - Pinescript/Tradingview - Plotchar each x bars

I have written a script which is currently plotting a label each 2 to 3 bars. What I want to do instead is to plot the label whenever my conditions are met each 15 bars.

So far here is what I've done:

signalCounter(_cond, _lookback) =>
_count = 0
for i = 0 to _lookback
    if _cond[i] == 1
        _count := _count + 1
_count

isBullish = signalCounter(isBullishSign, 15) == 1

plotshape(isBullish, style=shape.labelup, text="B", textcolor=color.white, color=color.green)

However, the results I am getting are incorrect and I doubt that there is a logical issue causing that mainly related to the for loop but I can't figure it out.


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