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Looking at the docs, it seems like you'd have to set one vector of the multi-dimensional array at a time.
Something (untested) like this:
But you probably need to tell R that 'mat' is a matrix first by preceding the above with something like:
Or perhaps a data.frame with named columns would be a better choice. See the R docs.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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