Hello,

My question sounds simple, but as I am desperatly searchin for a solution I am 
asking you all. :)

I try to filter out all non-numeric columns of a data frame using a for loop 
to go through all columns. My if clause looks like this:

        for(j in 1:length(data)) {

                ...
                if(!is.numeric(data[j])) skip <- "not numeric")
                ...
        }

When I do: is.numeric(data$vol) i get TRUE as result:
unfortunately this is not applicable in a for loop, because i need to go 
through all of the columns using j. 
I also tried to paste data$ and the name of the column , but this is always a 
character. 
 
When I do: is.numeric(data[257]) i get FALSE as result  
(257 is the corresponding column index to "vol")

Help needed! Thanks!
Markus




      
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