replace zeros in a block diagonal matrix with small random values?

say 'mat' is your matrix, then you could try something like (untested):

ind <- mat == 0
mat[ind] <- runif(sum(ind))

I hope it helps.

Best,
Dimitris
Hi All.

Imagine you have a large block diagonal matrix.  I'd like to replace
the zeros in this matrix with small random (runif) numbers.  Any ideas
for a simple and efficient way to do this?

Best regards,

Rick DeShon

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Dimitris Rizopoulos
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Erasmus University Medical Center

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replace zeros in a block diagonal matrix with small random values?

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