Re: [R] drop columns whose rows are all 0

[Gregorio R. Serrano]

dataset.1 <- dataset[, apply(dataset, 2, sum)>0]

Gregorio R. Serrano

2012/1/24 Francisco <franciscororol...@google.com>

> Hello,
> I have a dataset with 40 variables, some of them are always 0 (each row).
> I would like to make a subset containing only the columns which values are
> not all 0, but I don't know how to do it.
>
> I tried:
>
> for(cut_column in 1:40) {
>
> if(sum(dataset[,cut_column])!=**0) {
>                                columns_useful<-c(columns_**
> useful,dataset[cut_column])
>
> }
> }
>
> sorted_dataset<-subset(**dataset, select=columns_useful)
>
> But it doesn't work.
> Thank you
>
> Francisco
>
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-- 
Dr. Gregorio R. Serrano
Dpto. Economía Cuantitativa (UCM)
Voz:+34 91394 2361
Twitter: @grserrano_
http://www.grserrano.es

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