cannot read/write sparse matrices to matlab v4

[Daniel Heiserer]

Hi,

the read and write of sparse matrices to v4 matlab does not work:

octave:5> tic;load C4.mat;toc
error: load: can't read sparse matrices


When writing is tried, it seems octave will internally create a full matrix before writing it to the v4 file. This will explode once the matrix is too large:


N=1E7;C=sparse(ceil(N*rand(N,1)),ceil(N*rand(N,1)),rand(N,1),N,N);
save -v4 C4.mat C


octave version was:

octave:5> version
ans = 3.0.0


best regards, daniel 


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