[R] Deleting columns from a matrix
dxc13 at health.state.ny.us
Sun May 24 19:59:00 CEST 2009
Thanks, both of these methods work great!
Dimitris Rizopoulos-4 wrote:
> one way is:
> mat <-
> 10, 5)
> ind <- colSums(is.na(mat)) != nrow(mat)
> mat[, ind]
> I hope it helps.
> dxc13 wrote:
>> I have a matrix given by the code:
>> mat <-
>> This is a 10x5 matrix containing missing values. All columns except the
>> second contain missing values. I want to delete all columns that contain
>> ALL missing values, and in this case, it would be the first and fourth
>> columns. Any column that has at least one real number would remain. I
>> I can use "mat[,-1]" to delete the first column, but I have a much larger
>> matrix where it is impossible to tell how many columns contain all
>> values and which don't.
>> Is there a function or something else that may be able to help me
>> Thanks in advance.
> Dimitris Rizopoulos
> Assistant Professor
> Department of Biostatistics
> Erasmus University Medical Center
> Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
> Tel: +31/(0)10/7043478
> Fax: +31/(0)10/7043014
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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