[R] help with executing instruction every i-th run of loop

[Mark W Kimpel]

I am running a very long loop and would like to save intermediate 
results in case of a system or program crash. Here is the skeleton of 
what my code would be:

for (i in 1:zillion)
   {
    results[[i]]<-do.something.function()
    if (logical.test(i)) {save(results, "results.tmp")}
   }

logical.test would test to see if i/1000 has no remainder. What R 
function would test that?

Is there an even better way to address my need?

Thanks,
Mark
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Mark W. Kimpel MD  ** Neuroinformatics ** Dept. of Psychiatry
Indiana University School of Medicine

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