run optimization and you'll see

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MQL4 programming is easy ^^

How do I do that?
Thanks

Sorry, I meant to say How many price close values should I use?

Could someone please explain to me what this value does/means?
Thanks
iBullsPower(NULL, 0, 13,PRICE_CLOSE,0);

Looking for what 'int period' (third value) means, what a value of 13 or if I change to 20 is telling me or doing for me in an EA or Indicator? is 'int period' TF specific?

I'm using Null, then 0 - for any TF, 13 - not sure what this does, PC - I think most use 6 (Weighted close price, (high+low+close+close)/4) and 0 at the end.

I was told to do an optimization but don't know how.

Thanks

Don't know who gave you the advice, but sure he ment this:
1. Change the parameter, compare to the chart, fits to expectations ?, yes? fine, no, go to point 1

Your questions are going toward a BIG question: is there a Holly Grail?
Do you really want to hear the answer?

Ok, thanks, so by changing the third variable, what should I be looking for? I would then compare to the chart but I don't know what it does for me so I don't know what differences to look for Please explain what that variable has affect with?

Thanks

Not sure why you seem to be having difficulty understanding this (I thought my earlier response to your initial query was quite clear). It is simply the number of values (Open, Close, High, Low Prices etc.) used when calculating a function - in this case 'BullPower' but all the built-in functions are the same.

This number has the visual effect of 'smoothing' the line produced by the function - the bigger the number, the smoother the line. Just put a MA on any chart and play with the 'Period' variable. It should then be obvious as to its effect...

Glad to see that at least one of us is having fun

@ mladen - Ok, I'll try it, but before I do, in your experience, would the higher number be better? or does it just all depend on the currency used on and such?

When attaching some of indicators, MT4 just shows them on recent chart and long back history of them is not available.

How one can draw longer history ?