Applying function to vector by index

[Iago Mosqueira]

Hi,

I have a long vector classified in ten bins of different length according to
another vector. I want to estimate the variance, or any other function, of
the values from the first vector for each of the categories described by the
second, without using a loop. Is there any obvious way of doing this I am
overlooking? In R one could do

    sapply(split(d,idx),var)

where d is my data vector and idx the index vector.

Many thanks,


iago




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