Re: elements of a sparse matrix

[Jaana Tommiska]

Jordi Gutiérrez Hermoso kirjoitti 27.12.2010 kello 18:58:
If she really
> wants a matrix this large, she could actually save space by saving it
> as a full matrix instead of a sparse one, i.e. A = full(B'*B).
> 
Yes I really want a matrix this large but I haven't yet generated the actual 
matrix, I used sprand just testing if the product B'*B fits in the memory. The 
actual matrix B'*B should be sparser that that I got using sprand.

 When I was using my older computer the multiplication didn't succeed I got 
screen full of ~.
Using the newer computer it seemed that the result of the multiplication fits 
in the memory but when I try to access any element B(i,i) I get the message 
mentioned before. But B(i) works. Now I don't know if the matrix fits in the 
memory or not.
Jaana


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