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

Uwe Ligges ligges at statistik.uni-dortmund.de
Thu May 17 16:59:30 CEST 2007

Mark W Kimpel wrote:
> 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?

    !(i %% 1000)

Uwe Ligges

> Is there an even better way to address my need?
> Thanks,
> Mark

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