[R] Removing columns from a matrix using a list

[Uwe Ligges]

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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