Displaying 3 results from an estimated 3 matches for "4000x4000".
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4000,4000
2009 Dec 04
2
selective subsetting of a correlation matrix
Dear All,
I have a correlation matrix say 'M' (4000x4000) for 4000 genes and I want to
subset it to 'N' (190x190) for 190 genes.
The list of those 190 genes are in variable 't'. So the idea is to read the
names of genes from variable 't' and subset the matrix M accordingly.
Any thoughts are welcome!
Best
Lee
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2009 Nov 16
1
extracting values from correlation matrix
Hi! All,
I have 2 correlation matrices of 4000x4000 both with same row names and
column names say cor1 and cor2. I have extracted some information from 1st
matrix cor1 which is something like this:
rowname colname cor1_value
a b 0.8
b a 0.8
c f 0.62
d k...
2000 Jan 28
2
Memory woes
...ith memory consumption under R. I've tried
increasing the appropriate memory values, but it keeps asking for more;
I've even upped the heap size to 600M, significantly eating into swap
(256M real, 500+M swap). So, performance slows to a crawl.
What I'm trying to do is run isoMDS on a 4000x4000 matrix.
My first question is, how much memory should this matrix occupy? Is it
~4000^2 * sizeof(double)?
I have an idea about what's going on, but I'm not sure; perhaps someone
could correct me if this interpretation is wrong. Since R uses
call-by-value, all data structures are first du...