new error related to recent changset

[Ben Abbott]

David,

I just noticed the 3rd and 4th patch demos, and the isosurface demo, are 
failing.

I assume this is due to your recent changeset.

        http://hg.savannah.gnu.org/hgweb/octave/rev/c0a95a5c6d25

Is this fix the right thing to do, or might there be something wrong with the 
earlier change?

Ben

changeset.patch
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