Dynamic Arrays, can not place data in it

zelda_lee 2020.11.05 15:53

Hi all

I'm trying to use dynamic arrays for the first time but I can't seem to place data in them.

I've tried the simplest of approach to see what i'm doing wrong.

Basically in the below example I'm trying to fill in the array with 5 numbers that are exactly as the counter 'x'

If instead of [] I place [5] and declare an array of 5 slots it will work just fine

   int dynamic_array[];

   for(int x=0; x<5; x++)
     {
      dynamic_array[x] = x;
      Print("Value is " + IntegerToString(dynamic_array[x]));
     }

thanks in advance

William Roeder 2020.11.05 16:00 #1

Of course, you can't. There is no such thing as a dynamic array in MTx. The array has zero size, so you can't store anything.

Perhaps you should read the manual. ArrayResize - Array Functions - MQL5 Reference - Reference on algorithmic/automated trading language for MetaTrader 5
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zelda_lee 2020.11.05 16:06 #2

William Roeder:

Of course, you can't. There is no such thing as a dynamic array in MTx. The array has zero size, so you can't store anything.

Yes I've read that already but if I knew the array size before hand why would I want to create it a dynamic?...

shouldnt dynamic array be resized as needed throughout the filling out process?

Any questions from newcomers OnDeinit in indicators Declaration of Array Error

Enrique Dangeroux 2020.11.05 16:11 #3

zelda_lee:

Yes I've read that already but if I knew the array size before hand why would I want to create it a dynamic?...

shouldnt dynamic array be resized as needed throughout the filling out process?

Correct, but it does not happen automatically like in other (interpreter) languages. You have to resize them yourself according your needs.

zelda_lee 2020.11.05 16:36 #4

Enrique Dangeroux:

Correct, but it does not happen automatically like in other (interpreter) languages. You have to resize them yourself according your needs.

i see

thanks for clarifying

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