[R] for loop help please!

Erik Iverson eriki at ccbr.umn.edu
Fri Sep 10 18:23:19 CEST 2010


I do not follow.  Could you please provide a small reproducible example
of what "table1" might look like, and what you want as a result?

Surely you don't need a for loop.

alfredo wrote:
> Hi Everyone, 
> 
> I have a 2-dim data.matrix(e.g., table1) in which row1 specifies a range of
> values. row2 - rown specify the number of times I want to replicate each
> corresponding value in row1. I can do this with the following function: 
> 
> rep(c(table1[1,]),c(table1[X,])) #where X would go from 2 - n. 
> 
> Now, I can do this manually by changing the values of X and save each
> resulting array/vector in an object, or write a for loop that will iterate
> through the rows and output a new data.matrix in which row1 - rown will
> correspond to the vectors generated by replicating the values of row1 "row2
> - rown" independent times from the original data.matrix with the rep
> function shown above. So far I have been unable to get the for loop right. 
> 
> Any help will be most appreciated! Thanks beforehand for your help. 
> 
> Best, 
> 
> A



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