R help - Oct 2007 - How transform log(x+1) all data matrix?

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
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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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
> -- 
> View this message in context: 
http://www.nabble.com/How-transform-log%28x%2B1%
> 29-all-data-matrix--tf4587543.html#a13094677
> Sent from the R help mailing list archive at Nabble.com.
> 
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