How to use a dynamic array instead of rounding down in MML4 - MQL4 and MetaTrader 4

Andrei Sokolov 2022.01.15 09:51 #18571

Mihail Matkovskij #:

Why do I need your screenshot if I followed the link and read:https://docs.mql4.com/ru/trading/ordersend

So read it carefully. There, as I write, the opening price without any normalisation.

Mihail Matkovskij#:

Well you can call it what you like :)

I call it what it is, not "as you like".

Andrei Sokolov 2022.01.15 09:53 #18572

Mihail Matkovskij #:

Stop with the idle chatter.

Don't bring this rudeness to the forum, please.

Maxim Kuznetsov 2022.01.15 09:59 #18573

Historically there have been situations where an Ask Bid has come in non-normalised or High/Low/Close incorrect (EMPTY_VALUE), so all incoming data should be checked. There can be server component restarts or reconciliation between peers. There can also be simple errors.

And when sending a trade order, you should make every effort on your part to make sure it is correct. Therefore ALWAYS normalise prices by Digits and volumes by minLot,lotStep.

Strategy Tester Result Any rookie question, so New metatrader 4 compatible

Mihail Matkovskij 2022.01.15 10:02 #18574

Andrey Sokolov #:

Don't bring that boorishness onto the forum, please.

That's it. No comments.

Mihail Matkovskij 2022.01.15 10:05 #18575

Maxim Kuznetsov a trade order, you have to do your best to make sure that it is correct.

Don't worry about it. He who needs to know. :)

Владимир Казаков 2022.01.15 10:09 #18576

Mihail Matkovskij #:

This is because static arrays cannot be dimensioned by variables. A dynamic array should be used instead:

And tell me, is there a difference in processing speed between a static array and a dynamic one?

Mihail Matkovskij 2022.01.15 10:15 #18577

Владимир Казаков #:
And tell me, is there a difference in processing speed between a static array and a dynamic one?

If you compare the handling of two very large arrays, static and dynamic, there may or may not be a difference... In normal use, there is practically no difference.

Sergey Dymov 2022.01.15 10:17 #18578

Mihail Matkovskij, Andrey Sokolov, thanks friends, for the clear and quick answer!

There really was an error with OP_SELL, OP_BUY (mixed up due to inattention). I've normalized everything by nDigits, added a check by OrderSend for errors. I hope everything will work. I cannot check it now, the market is closed )). Now till Monday

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Maxim Kuznetsov 2022.01.15 10:29 #18579

Mihail Matkovskij #:

If you compare 2 very large arrays, static and dynamic, there may or may not be a difference... In normal use, there is almost no difference.

Unfortunately, there is...

The difference in the use of the two functions :

double foo(someargs..) {
   double tmpdata[];
   ArrayResize(tmpdata,100);
   ...
}
static double tmpdatabar[100];
double bar(someargs..) {
   ...
}

will be significant.

If you know in advance the maximum size of the array and it's not too big 🚲

it's better to spread it out beforehand

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Andrei Sokolov 2022.01.15 11:00 #18580

Владимир Казаков #:
Is there a difference in processing speed between a static array and a dynamic one?

What is meant by treatment?

In any case, the existence of a difference and its size to a particular case can be learned from profiling.

Any questions from newcomers on MQL4 and MQL5, help and discussion on algorithms and codes - page 1858