[R] Removing columns from a matrix using a list

Uwe Ligges
2006-03-28T16:57:31Z

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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