Operations with sparse matrices

Can I obtain an answer to this question? Or is it so trivial that I should have found the solution in the manual? I looked for it, but I didn't find it.

I think something is going wrong in the initialization.

Try this:

sparse matrix H;
T = 5;
H = spEye(T);
H = H + spcreate(T,T,ones(T-1,1),seqa(2,1,T-1), seqa(1,1,T-1));
print H'*H;

Thanks a lot for the answer. Now it works, although I don't see what makes the difference. I was also able to multiply H by a dense matrix: H * ones(T, 1) although it becomes a dense matrix which I need to convert into a sparse matrix.

If I can make a request for newer version of Gauss is to make sparse matrix operations easier and better. In Matlab it works very well, but I'd like to have it in Gauss too.

Sorry for bothering again, but it's getting weird. The code excerpt you gave me works. More precisely, this one:

sparse matrix H;
T=5;
H = spEye(T);

H = H + spCreate(T,T,ones(T-1,1),seqa(2,1,T-1), seqa(1,1,T-1));

print H'*H;

However, when I change the sign in the fourth row to -, it gives me the same error message as above.

Sorry for bothering again, but it's getting weird. The code excerpt you gave me works. More precisely, this one:

sparse matrix H;
T = 5;
H = spEye(T);
H = H + spCreate(T, T, ones(T-1, 1), seqa(2, 1, T-1), seqa(1, 1, T-1));
print H'*H;

However, when I change the sign in the fourth row to -, it gives me the same error message as above. I don't understand this, is it some bug?