---Alex Rufon wrote:
> What I want to do is to replace all zero in the matrix with infinity.

   ]M=: 4 [EMAIL PROTECTED]
6 5 9 2
4 9 0 7
0 4 6 8
3 8 1 2

amendZeros=: _&(([: I. 0 = ,@])})

   amendZeros M
6 5 9 2
4 9 _ 7
_ 4 6 8
3 8 1 2

Check out Chapter 6.3.3 Linear Indices in Learning J

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