[R] column permutation of sparse matrix

[khai]

Thanks very much for responses. The 2 suggestions each do a part of what I
want. Jean's proposal permutes nonzero elements within each row but shifts
the location of the nonzero element around in the j slot of each i row.  And
Douglas's idea keeps the second part but permutes the entire x slot values.
I'll try to see how I can combine these 2 ideas but it's not immediately
obvious to me. =}

-khai

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