feat(stats): add nanmapcorr packages

[hans2001]

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Resolves #5564 .

Description

What is the purpose of this pull request?

This pull request introduces the nanmapcorr package—a thin wrapper around mapcorr that enhances robustness. It adds type checking so that if a NaN or non-numeric value is provided, the update is skipped and the accumulator continues to return the previously computed mean directional accuracy. Test cases have been updated to verify that these edge cases are correctly handled.

This pull request:

test coverage:

example:

benchmark:

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: add stats/incr/nanmapcorr #5564

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/incr/nanmapcorr	$153/153$ $+100.00\mathrm{\%}$	$13/13$ $+100.00\mathrm{\%}$	$2/2$ $+100.00\mathrm{\%}$	$153/153$ $+100.00\mathrm{\%}$

The above coverage report was generated for the changes in this PR.