On 03/08/2010 1:10 PM, Dimitri Liakhovitski wrote:
I understand the question I am about to ask is rather vague and
depends on the task and my PC memory. However, I'll give it a try:
Let's assume the goal is just to read in the data frame into R and
then do some simple analyses with it (e.g., multiple regression of
some variables onto some - just a few - variables).
Is there a limit to the number of columns of a data frame that R can
handle? I am asking because where I work many use SAS and they are
running into the limit of >~13,700columns there.
Since I am asking - is there a limit to the number of rows?
Or is the correct way of asking the question: my PC's memory is X. The
.txt tab-delimited file I am trying to read in has the size of YYY Mb,
can I read it in?
Besides what Jim said, there is a 2^31-1 limit on the number of elements
in a vector. Dataframes are vectors of vectors, so you can have at most
2^31-1 rows and 2^31-1 columns. Matrices are vectors, so they're
limited to 2^31-1 elements in total.
This is only likely to be a limitation on a 64 bit machine; in 32 bits
you'll run out of memory first.
Duncan Murdoch
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