Rather than having to testing for 0 (or undef) in all your further calculations, it may be easier (and mathematically acceptable) to replace your zeros with a very small number, say 1e-308:

map $_//= 1e-308, @$_ for @matrix;

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which should have negligible affect upon any calculations, but avoid lot of special casing.

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In reply to Re: Calculate log of matrix values by BrowserUk
in thread Calculate log of matrix values by madM

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