Added mapPos and applied a few linter suggestions

Daniel-Diaz / matrix

A Haskell native implementation of matrices and their operations.

BSD 3-Clause "New" or "Revised" License

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Closed AndreasPK closed 7 years ago

AndreasPK commented 7 years ago

Implemented mapPos similar to the suggestion in https://github.com/Daniel-Diaz/matrix/issues/25 together with a test case.

I also applied a few Linter suggestions. (Using fromMaybe, removed duplicate import and a few redundant braces)