[R] Removing columns from a matrix using a list

Peter Wilkinson pwilkinson_m at xbioinformatics.org
Tue Mar 28 18:17:20 CEST 2006

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]

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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