[R] working with sparse matrix

[davefrederick]

Hi, I have a 500x 53380 sparse matrix and I am trying to dichotomize it.
Under sna package I have found event2dichot yet it doesnt recognize sparse
matrix and requires adjacency matrix or array. I tried to run a simple loop
code 

for (i in 1:500) 
for (j in 1:53380) 
if (matrix[i,j]>0) matrix[i,j]=1

yet this takes a lot of time to run, I mean it has been last two hours and
it is stil running.

I am wondering if there is a shortcut or a hack here someone can recommend.

thanks all.

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