Re: Sparse Matrix, Memory Allocation
- To: mathgroup at smc.vnet.net
- Subject: [mg31671] Re: Sparse Matrix, Memory Allocation
- From: "Lawrence A. Walker Jr." <lwalker701_remove_ at earthlink.net>
- Date: Fri, 23 Nov 2001 05:47:13 -0500 (EST)
- Organization: Morgan State University, COMSARE
- References: <9t2tnm$6pi$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi Inkyu, You don't have to initialize the entire matrix when using the SparseLinearSolve[] function. I suggest specifying only the bands of the matrix using the following for K: {{1,1}->a1, {1,2}->a2, ..., {K,N}->aM}. K=Table[0,{70000},{70000}];(* Initialize the matrix K *) Lawrence Inkyu Rhee wrote: > I have a 70000 by 70000(or more) banded sparse matrix. > and this matrix will be updated by specific law for 50 loops. > In each loop, I need to linear solution of this. > > My prblems are: > > I could not specify this matrix: > > K=Table[0,{70000},{70000}];(* Initialize the matrix K *) > > when I trying this in my machines ((1) sun:ram 750M, swap 2665M, > (2) window:A800mhz, 128Mb), > machine gives me 'Out of Memory, Exiting'. > How do you specify this matrix efficiently? > > If this works well, I will update these components of matrix > using certain law. Then I need to solve the equations. > > Developer`SparseLinearSolve[K,x] > > I tried this part using 10000 by 10000 instead of 70000. > It also give me 'Out of Memory ...'. > > Thanks for any help, > > I. Rhee > >