[R] memory

Martin Gotz xgotz at informatics.muni.cz
Thu Nov 16 19:40:12 CET 2000

On Thu, 9 Nov 2000, Uwe Ligges wrote:

> > how big memory(RAM&HDD) I need for clustering data(hierarchical or
> > iterative optimalization method), when I have 10000 observation with some
> > variables? 
> > Now I can use 1GB RAM and some space on HDD.
> Hm. That highly depends on the functions you are going to use.

function hclust()

> It is one thing to import a data.frame, but another one to do some
> calculations on the data. The memory consumption highly depends on the
> functions, you are using (creating copies of (parts of) the data, ...).

10000 observation means 10000x10000 matrix (distance matrix for
hclust). How big space I need for one integer number? (8byte?) 
It's matrix with 100 000 000 elements.
I made some experiments with matrix  3000x3000 and I shutdown UNIX server
station (R was invoke with nice 19) :(

> You won't need 1GB to calculate the mean of 10000 observations for
> example. ;-)
> Uwe Ligges

What is highest memory limit?  

Martin Gotz

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