[R] Fastest way to merge matrix columns into a comma delimited string?

From: Jonathan Greenberg <greenberg_at_ucdavis.edu>
Date: Tue, 15 Jun 2010 11:27:59 -0700


Say I have a matrix:


I would like to have an output character vector where each line is row's values delimited by commas, e.g.:



What is the fastest way of doing this? I can paste() row-by-row but this seems an inefficient approach to doing this. Thanks! I'm not asking how to write a CSV file, mind you, I want the array as an R data.frame or vector.


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