Re: deleting rows from sparse matrices leads to seg fault sometimes

[Lev]

I have a code (using octave 3.6.1) by which one can debug it in depth.

call it as 

supportThreshold( 3,10, sparse(rand(1000,1000)>0.99) );

it will segfault.
If you have doubt, you may load a constellation by uncommenting the load
function call 
and download aa.dat from http://justpaste.it/octaveSegfault


/
function uis = supportThreshold( userMinSupport , itemMinSupport , uis )
% load aa.dat
    for i=1:10
        s=size(uis)

        user_event_count = sum(uis,2);
        inx=find(user_event_count<userMinSupport);
        length(inx)
        uis(inx,:)=[];

        item_event_count = sum(uis);
        inx = find(item_event_count&lt;itemMinSupport);
        length(inx)
        uis(:,inx)=[];

        if all(s==size(uis))
            break;
        endif
    end
end
&lt;/i>


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