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Tutorial BP Single Class Multidimensional Array

Hi here’s something that I think, that it could be useful for someone:
Base Class:
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Variables:
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//I’m using Actor (cause I need some functionality), but it can be simplified using just UObject
Initialize using this function “Setup”:

Make functions to use your multidimensional array:
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Usage:
Initialize:

Get Element from array:

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Thank you very much. :slight_smile:

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If you need to make a multi-dimensional array, structs of arrays can work too.

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More simple yes, but less functionality and when you modify something in the structure, it has the risk of corrupting, structures are very unstable.

I’ve made some small changes, this new version will allow more things:
Base Class:
image
Variables:
image
image
image

//I’m using Actor (cause I need some functionality), but it can be simplified using just UObject

Initialize using this function “Setup”:
image




(I’ve used arrays instead of a map because maps dont respect order of input)
Setup Auxiliary Functions:
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This is only for child classes:
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Make functions to use your multidimensional array:
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To loop through you multidimensional array create a macro library using its parent class:
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Create Function in Macro:

On base class:


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Multidimensional Array with int/float values:
Create child Class:
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variables:
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Make functions to use your multidimensional array:

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(I like to create my own setters and getters)
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To fill array with one value:
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Usage:



Idk if this is what you’re trying to achieve, but if you’re trying to make a general-purpose multidimensional array, it can be done simply by converting it into a one-dimensional array:

The size of the array is the product of the resolution (size) of all axes (e.g. resX * resY for 2D, and resX * resY * resZ for 3D).
And here are the indexing functions for 2-dimensional & 3-dimensional arrays, which include both coordinate-to-index and index-to-coordinate:


Coordinate-to-index converts a multidimensional coordinate into a one-dimensional coordinate (i.e. the index in the one-dimensional array), and index-to-coordinate does the opposite.
This also allows you to convert between dimensions; e.g. to convert from 2D to 3D, do 2D->1D->3D.

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This is a solution for someone like who is not really good at math like me and want a self made multimensional array solution: But hey, your comment here could be useful for other people who has a better understanding of math. :slight_smile:

Sorry, should’ve posted an actual example.
The first image shows the utility functions, and the second image shows how to use them.
For your case, you only need the Setup & CoordToIndex functions; the IndexToCoord is an extra utility.

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What I’m trying to do and I’m sorry for not understanding you in the first comment, is to show a how to have a multi purpose multidimensional array, not just for numbers but anything else. :smiley:
Edit: maybe my naming scheme was not the best and i’m also sorry for that too.

Oh, I see what you mean. I guess I misunderstood what you were trying to do. Sorry for the confusion. :sweat_smile:

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