Hi,

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


Tim





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