Dynamic 2-Dimension Arrays

[Andriy Moraru]

How do I declare dynamic 2-dimension arrays?

The following code generates error:

int arr[][];

[onewithzachy]

Go here and look at example.

[Andriy Moraru]

It hardly has anything to do with my question. It talks about initialization instead of declaring and says nothing about dynamic 2-dimension arrays.

[onewithzachy]

enivid:
It hardly has anything to do with my question. It talks about initialization instead of declaring and says nothing about dynamic 2-dimension arrays.

Try this 

int qwerty [][2];

It's 2 dimensional array, the first bracket tell the array from left to right. the second bracket tell the array from top to bottom, and you have to specify how many of them - how many element of them.

[Andriy Moraru]

onewithzachy:

Try this 

It's 2 dimensional array, the first bracket tell the array from left to right. the second bracket tell the array from top to bottom, and you have to specify how many of them - how many element of them.

Thanks, but that they only first dimension will be dynamic. I need both dimensions to be dynamic as I don't know the sizes beforehand.

[investeo]

enivid:
Thanks, but that they only first dimension will be dynamic. I need both dimensions to be dynamic as I don't know the sizes beforehand.

You can find an example in one of my articles - look at  https://www.mql5.com/en/articles/196 (CChartEditTable implementation)

[Andriy Moraru]

investeo:
You can find an example in one of my articles - look at  https://www.mql5.com/en/articles/196 (CChartEditTable implementation)

Thanks! That's an interesting solution, but I doubt that I'll be able to use it with CopyBuffer() or even CopyArray()...

[Rashid Umarov]

See Operation Overloading

[Andriy Moraru]

Rosh:

See Operation Overloading

Looks interesting. Thanks! Too bad there's no intrinsic support for 2-dimension dynamic arrays though :-).

[autotradefx]

 

Hi, I had the same problem, I'm just learning and I don't understand completely the solutions given, but this idea worked for me. I hope to help.

  struct dynamic_2D
      {
       double col[];
      };
   
   dynamic_2D u[];

   int nrow=10;
   int ncol=20;
   ArrayResize(u,nrow,0);
   for(int i=0; i<=nrow-1; i++) { ArrayResize(u[i].col,ncol,0); ArrayInitialize(u[i].col,0); }

 

[Matheus Carmo]

Andriy Moraru:

How do I declare dynamic 2-dimension arrays?

The following code generates error:

Hello Andriy,

The multidimensional arrays are dinamic "ONLY" at the first dimension...

Take a look at the article about arrays...

MQL5 PROGRAMMING BASICS: ARRAYS

https://www.mql5.com/en/articles/567

Hope it helps...

If you need dinamic on more than 1 dimension, you will need to create a code with "for example" struct... Like autotradefx showed up this...