[Octave-bug-tracker] [bug #47368] test of svds.m fails on Windows (Octave 4.0.1-rc3)

[Hartmut]

Follow-up Comment #2, bug #47368 (project octave):

In the file svds.m I find the following code:


    ## We wish to exclude all eigenvalues that are less than zero as these
    ## are artifacts of the way the matrix passed to eigs is formed. There
    ## is also the possibility that the value of sigma chosen is exactly
    ## a singular value, and in that case we're dead!! So have to rely on
    ## the warning from eigs. We exclude the singular values which are
    ## less than or equal to zero to within some tolerance scaled by the
    ## norm since if we don't we might end up with too many singular
    ## values.
    tol = norma * opts.tol;
    ind = find (s > tol);
    if (length (ind) < k)
      ## Too few eigenvalues returned.  Add in any zero eigenvalues of B,
      ## including the nominally negative ones.
      zind = find (abs (s) <= tol);
      p = min (length (zind), k - length (ind));
      ind = [ind; zind(1:p)];
    elseif (length (ind) > k)
      ## Too many eigenvalues returned.  Select according to criterium.
      if (b_sigma == 0)
        ind = ind(end+1-k:end); # smallest eigenvalues
      else
        ind = ind(1:k);         # largest eigenvalues
      endif
    endif
    s = s(ind);


I think this means that the patch you mentioned is NOT included here.

The windows version of 4.0.1-rc3 that gave me this error was installed from
the "official" exe-installer at alpha.gnu.org/gnu/octave .

Looking at the mentioned patch, it seems to me that is was only applied to the
default branch in the repository. I assume that the 4.0.1 release will be
taken from the stable branch. Maybe this is why this patch is not included in
the 4.0.1-rc3 release candidate?

Note: When I only run "test svds.m" in this installation then I get 6 passing
tests (out of 6), no errors in this case. Even running this test 100 times (in
a for loop) only gives me passing tests. I don't understand this. If you want
me to rerun the __run_test_suite__ command again on this installation, then
please let me know (it takes quite a while on this computer...)



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