[R] Removing columns from a matrix using a list

Uwe Ligges ligges at statistik.uni-dortmund.de
Tue Mar 28 18:57:31 CEST 2006

Peter Wilkinson wrote:

> How does one remove columns either by name ("Exp1", "Exp2", "Exp3", ...
> "Exp100") or by column number from a matrix or data.frame using a list of
> names mynames = ("Exp10,"Exp20","Exp55","Exp67")
> I would something in the form of (I know this does not work):
> myMatrixEdited = myMatrix[,-mynames]

myMatrixEdited <- myMatrix[ , !(colnames(myMatrix) %in% mynames)]

Uwe Ligges

> Or I would like to find the column numbers of the names in the list, and use
> the column numbers to remove the columns in the matrix or data.frame.
> Peter W.
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