OPR-computation-related linear algebra problem

[Ether]

Originally Posted by flameout

Since no-one has done Octave yet, I'll go ahead and do it

Thanks flameout.

I can't do SciLab or R because I don't know how to use those

Just installed SciLab 5.4.1 with Intel Math Kernel Library 10.3 on a 7-year-old desktop PC:

• Intel Pentium D 3.4GHz (x86 Family 15 Model 6 Stepping 4)
  
• 32-bit XP Pro SP3
  
• 500GB Seagate Barracuda 7200

-->stacksize(70000000);
 
-->tic; N=read("N.dat",2509,2509); toc
 ans  = 1.672  
 
-->d=read("d.dat",2509,1);
 
-->tic; x=N\d; toc
 ans  = 1.672  
 
-->tic; Ns=sparse(N); toc
 ans  = 0.141  
 
-->tic(); xs = umfpack(Ns,'\',d); toc
 ans  = 0.14