I am using the normalized cuts package from http://www.cis.upenn.edu/~jshi/software/Ncut_9.zip (on Windows 7)
This used to work fine with Matlab2010a. However I have upgraded to Matlab2013a (32 bit student version) and I now get the following error:
Error using arpackc
Expect 2 output arguments
Error in eigs_new (line 240)
arpackc( aupdfun, ido, ...
Error in ncut (line 83)
[vbar,s,convergence] =
eigs_new(@mex_w_times_x_symmetric,size(P,1),nbEigenValues,'LA',options,tril(P));
Error in ncutW (line 9)
[NcutEigenvectors,NcutEigenvalues] =
ncut(W,nbcluster);
Error in NcutImage (line 18)
[NcutDiscrete,NcutEigenvectors,NcutEigenvalues]
= ncutW(W,nbSegments);
Error in demoNcutImage (line 25)
[SegLabel,NcutDiscrete,NcutEigenvectors,NcutEigenvalues,W,imageEdges]=
NcutImage(I,nbSegments);
Obviously the new_eigs()
function in ncuts
is incompatible with the ARPACK version in the latest Matlab.
eigs()
function. Why can't I just use Matlab's built-in eigs()
instead of eigs_new()
(it does seem to work).There are two solutions to this:
Use Matlab's eigs()
function instead of the eigs_new()
provided in the normalized cuts package. I guess eigs_new()
was designed to solve some compatibility issue with a previous version of Matlab, and is now itself causing an issue.
Modify eigs_new()
. Where there is a call to arpackc()
in eigs_new()
, make the call like in the tool box version of eigs()
.
So, e.g.:
arpackc( aupdfun, ido, ...
bmat, intconvert(n), whch, nev, tol, resid, ncv, ...
v, ldv, iparam, ipntr, workd, workl, lworkl, info );
becomes
[ido, info] = arpackc( aupdfun, ido, bmat, intconvert(n), whch, ...
nev, tol, resid, ncv, v, ldv, iparam, ipntr, workd, workl, ...
lworkl, info );
There were only two places where this had to be changed to make it work (although there other calls to arpackc()
which don't actually get executed).
I am still not sure why eigs_new()
exists at all.
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