[Octave-bug-tracker] [bug #58445] significant slow down in stable version for cellfun invocations which use function handles

[John W. Eaton]

Follow-up Comment #3, bug #58445 (project octave):

I'm pretty sure I caused the problem with this changeset:

http://hg.savannah.gnu.org/hgweb/octave/annotate/8bd9fd99c12a/libinterp/corefcn/cellfun.cc#l468

What does Matlab do if "numel" (for example) is a handle to a subfunction or
nested function?  In that case, does it still call the built-in numel or does
it call the subfunction and (probably fail)?  Here's an example:


function foo ()
  x = {1, [2,3;4,5]};
  %% Do both of the following do the same thing?
  %% Do they call the built-in numel function for
  %% each element of the cell array or do they call
  %% the numel subfunction defined in this file?
  cellfun ('numel', x)
  cellfun (@numel, x)
end
function r = numel (x)
  % subfunction
  r = 13;
end


With an answer to the above, I can probably fix the problem.

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