[R] For loop to cycle through datasets of differing lengths

Schatzi adele_thompson at cargill.com
Thu Nov 3 19:41:46 CET 2011

I have encountered this problem on several occasions and am not sure how to
handle it. I use for-loops to cycle through datasets. When each dataset is
of equal length, it works fine as I can combine the datasets and have each
loop pick up a different column, but when the datasets are differing
lengths, I am struggling. Here is an example:


for (i in 1:3){
if (i==1) Data<-Set1 else if (i==2) Data<-Set2 else Data<-Set3

I don't always want to plot them and instead do other things, such as fit a
non-linear equation to the dataset, etc. I end up using that "if" statement
to cycle through the datasets and was hoping there is an easier method.
Maybe one would be to add extra zeros until they are the same length and
then take out the extra zeros in the first step. Any help would be

In theory, practice and theory are the same. In practice, they are not - Albert Einstein
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