[R] Odp: How transform log(x+1) all data matrix?

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 08.10.2007 13:20:56:

> 
> I just have started using R. I am working with abundance data (57 
parasite
> species found in cod) and I would like to know if there is possible to
> transform all the data matrix. I read that in LDA it is possible to do 
it

By data matrix you mean data frame? However both matrix or numeric data 
frame can be transformed by

log(x+1)

if x is your data.

Regards
Petr


> with log transformation but I need log (x+1) transformation because I 
have
> many "0". It is important for me because I am testing random Forest and 
LDA
> and I did 160 random files (training and testing files). 
> 
> Thank you very much
> 
> All the best
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