Subset a matrix by dimension names in a vector R?

I think Tim Riffe's answer is the most direct. If the user were unsure whether the 'nodenames' vector were a subset of both the rownames() and the colnames() values, then this might be a bit safer.

You can subset matrices based by index numbers, by dimension names (via a character vector, such as your nodenames), by logical vectors, and possibly other things that are beyond me.

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