[R] log transformation

[jarry]

Hi,

I am reading an article in which, first, some given "p-results" are
obtained, and, second, these are afterwards transformed and expressed as the
"NEGATIVE base-10 logarithm of the p-value". 

My question is if anyone could indicate how is such transformation achieved
with R and how are they expressed exponentially, as in for example 1.8E-18.

Thank you!
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