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cumsum of CGA array

MagnusLundevall

How can I get "cumsum" of an array in CGA? Iterate and build a new array recursively in some way?

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Accepted answers

JonasObertuefer

Hi @MagnusLundevall,

Yes exactly, here is an example:

cumsum(array) = cumsum(array, 1)
cumsum(array, i) =
	case size(array) <= i: array
	else:
		cumsum(setElems(array, i, array[i]+array[i-1]), i+1)
		
Init -->
	print(cumsum([2,5,1,3.5,8]))

May I ask about the usecase? If it is something common we might add it as builtin function in the future, so you don't have to rely on recursion for this.

Cheers,
Jonas

All comments

JonasObertuefer

I see. Thanks for the informations.

For min/max of an array there is currently no dedicated function, but you can use sortIndices(), there is an example for this case in the cga reference: https://doc.arcgis.com/en/cityengine/latest/cga/cga-sort-indices-function.htm

MagnusLundevall

Thanks! I have used it in trying to solve Split face into rectangular pieces - Esri Community
I extract scope.sx for each face edge in an array and want to process it to compute split x's.
I also had the need for min(array) and max(array) that return the smallest and largest element, respectively. I did write them in the same recursive manner. It would be great to have these in CGA.

JonasObertuefer

Hi @MagnusLundevall,

Yes exactly, here is an example:

cumsum(array) = cumsum(array, 1)
cumsum(array, i) =
	case size(array) <= i: array
	else:
		cumsum(setElems(array, i, array[i]+array[i-1]), i+1)
		
Init -->
	print(cumsum([2,5,1,3.5,8]))

May I ask about the usecase? If it is something common we might add it as builtin function in the future, so you don't have to rely on recursion for this.

Cheers,
Jonas

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