[R] RData size

jim holtman jholtman at gmail.com
Wed Jan 5 02:36:46 CET 2011

You can confirm it very easy by adding 'compress = FALSE' to the save
function.  You will see that the .RData files are the same size since
you are not compressing them.

On Tue, Jan 4, 2011 at 7:19 PM, array chip <arrayprofile at yahoo.com> wrote:
> Hi, I noticed a Rdata size issue that's puzzling to me. Attached find 2 example
> datasets in text file. Both are 100x5, so the sizes for both text file are the
> same. However, when I read them into R, the sizes are much different:
> tt<-as.matrix(read.table("tt.txt",header=T,row.names=1))
> save(tt,file='tt.RData')
> tt.big<-as.matrix(read.table("tt.big.txt",header=T,row.names=1))
> save(tt.big,file='tt.big.RData')
> "tt.RData" is 2KB while "tt.big.RData" is 5KB. This is not a big deal with the
> example datasets, but my real datasets are much larger, the difference is 35MB
> vs. 1MB for the RData objects.
> The difference between the 2 datasets above is that "tt.big" is a smoothed
> version of "tt", so there are a lot less unique values in tt.big than tt, I
> guess this is the reason for the difference in sizes of RData objects, can
> anyone confirm?
> Thanks
> John
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Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?

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