I’ve just had a look at your submission, and I think it performs a different function (though in 2D cases, the results are the same with the dim swapped). I’ve written a comment on your submission illustrating the difference.
http://www.mathworks.com/matlabcentral/fileexchange/16467-apply
I’ve also linked to your function from a comment on my own:
http://www.mathworks.com/matlabcentral/fileexchange/28255#comments

All the best,
Ged

I found something similar,
http://www.mathworks.com/matlabcentral/fileexchange/25472
but decided to implement my above suggestion, to make it simple to do things like

  dimfunc('sum', data, dim)
  % equivalent to sum(data, dim)

with functions that don’t share sum’s dim-handling behaviour. I hope other people find it useful — it’s available here:
http://www.mathworks.com/matlabcentral/fileexchange/28255

Best,
Ged

http://www.mathworks.com/matlabcentral/fileexchange/16467-apply

It’s a nice idea and something worth considering.

–Loren

Yes, sum can sum a double vector:

x = [.3 .4 pi/3]
y = sum(x)
x =
          0.3          0.4       1.0472
y =
       1.7472

You must have something else going on your code w.r.t. indexing. It looks like your indices into the data you want to sum aer not valid ones.

–Loren

When I use sum to sum a vector of type double I get this error message:
??? Subscript indices must either be real positive integers or logicals.

The values in my vector range from 0.6 to 0.9 – so they are all positive but are floats (not integers). Maybe that is the problem…

But your example here seems to work with floats…

My question is: Can I use sum to sum floats? (I know cumsum works…)

Thanks. Btw, your blog has taught me a lot.

Thank you – and that explains why it runs longer from the command line compared to some work arounds I tried on the
script.

It works from a script if you first type

feature accel off

I will report the bug. Thank you.\

–Loren

I’m running R2007b.
Did you run it straight at the command window ?
Then I also don’t have any problems.
The problem arises when running those lines from a script.