expand array code

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im looking after the expand array code, any math/script masters know about it?

i can use the module but actually i wire two outputs from the script to module (array+factor, and get the array back)
wich i find a bit weird, even if working.

i wish there was kind of 'look module code' feature to decipher usine modules lol

will try to search on the web, but if any has the formula, im takin'