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help sprandsym


From: Riccardo Corradini
Subject: help sprandsym
Date: Tue, 23 Jan 2007 14:51:24 +0100 (CET)

Dear all,
I am using octave2.9.9 CVS when I ru the following program
n = 500; density = 0.1; knum=0.5;

for i=1:5
    density = density*0.5;
    X = sprandsym(n,density);
    y = randn(n,1);
    tic; b = X\y; time1 = toc;
    xf = full(X);
    tic; b = xf\y; time2 = toc;
    fprintf('# of non-zero elements in X = %6d \n',nnz(X));
    fprintf('sparse matrix solution time = %8.3f \n',time1);
    fprintf('full matrix solution   time = %8.3f \n',time2);
endfor

I obtain

error: number of rows must match (251 != 250) near line 69, column 47
error: evaluating assignment _expression_ near line 68, column 9
error: evaluating if command near line 64, column 5
error: evaluating if command near line 36, column 3
error: called from `sprandsym' in file `/usr/share/octave/2.9.9+/m/sparse/sprandsym.m'
error: evaluating assignment _expression_ near line 6, column 4
error: evaluating for command near line 4, column 1
error: near line 14 of file `example22.m'

Could you please help me?
Thanks a lot
Riccardo


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