How to generate an array according to the rules defined by oneself?

How to generate an array according to the rules defined by oneself?
I have a function like `func:: Int->Int->Float`, which represents calculating values based on index

The issue provides no repository file, test, or entry point to inspect. Start by locating the Haskell array-generation API and determine whether the requested Int -> Int -> Float function is already supported; done would require a documented, agreed approach for generating an array from that rule.

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