[R] replace NULL with NA in matrix

From: Tim Smith <tim_smith_666_at_yahoo.com>
Date: Thu, 17 Apr 2008 06:28:25 -0700 (PDT)


I had a matrix with NULL values, which I wanted to replace with NA. Is there an efficient way to do this?

Small sample input matrix:

        A B C D E

1 5222.18 6355.10 4392.68 2607.41 4524.09
2    NULL  257.33    NULL  161.51  119.44
3    NULL  274.80  305.28  443.27    NULL
4 1759.76 1556.45 1224.06 1558.73 1837.09


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