[R] Multiple counters in a single for loop

[MacQueen, Don]

I don't know of any such option, but it's easy enough to achieve something more or less equivalent.

x <- runif(5)

for (ir in seq(nrow(myi <- cbind(x, 1:length(x))))) {
  i <- myi[ir,1]
  j <- myi[ir,2]
  cat(i,j,'\n')
}

I consider that for() statement to be ugly and unreadable. Normally I would build the matrix myi before constructing the loop, and make other changes for clarity. But in this instance I wanted to make it a one-liner, just to more or less mimic the python.

And having now read Bert's reply, he makes a good point. For many things one might want to do with such a loop, R can do them without an explicit loop.

-Don

--
Don MacQueen
Lawrence Livermore National Laboratory
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Livermore, CA 94550
925-423-1062
Lab cell 925-724-7509
 
 

On 8/24/18, 6:44 AM, "R-help on behalf of Deepa" <r-help-bounces using r-project.org on behalf of deepamahm.iisc using gmail.com> wrote:

    Hello,
    
    Is there an option to include multiple counters in a single for loop in R?
    
    For instance, in python there is
    
    for i,j in zip(x,range(0,len(x))):
    
    
    Any suggestions?
    
    	[[alternative HTML version deleted]]
    
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