Setting the log to zero ...

I didn't suggest setting the log to zero. Or mention doing anything to the logs.

its log should be a negative number whose magnatude exceeds any of the other logs.

And if you set values that are 0(.00000) to 1e-308, then when their logs are taken, they become 

say log(1e-308);;
-709.196208642166

[download]

which fulfills your "negative number whose magnatude exceeds any of the other logs." in spades.

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In reply to Re^5: Calculate log of matrix values by BrowserUk
in thread Calculate log of matrix values by madM

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