I have a problem with permutations functions in R

I just started using R so maybe it is an easy question

I need to obtain all the 9.somthingExp 157 permutations that can be
given from the number from 1 to 100

I wrote the following commands:

 

> library(gregmisc)

>options(expressions=1e5)

     cmat <- combinations(300,2)

     dim(cmat) # 44850 by 2 

>permutations(n=100, r=100)

 

Unfortunately at a certain point (after few minutes) I get the following
Error:

Error: cannot allocate vector of size 609.1 Mb

 

What can I do?

Thanks

Fabio


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