sum function not working
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when I enter:
sum([1 2 3])
i get the error message: Index exceeds matrix dimensions.
This seems like a bug.
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Accepted Answer
Azzi Abdelmalek
on 11 Sep 2013
Edited: Azzi Abdelmalek
on 11 Sep 2013
You've probably used sum as a variable. Check in your code, you will find that sum was used as a variable. Clear the variable sum then use again the sum function
clear sum
sum([1 2 3])
More Answers (2)
Jan
on 12 Sep 2013
Edited: Jan
on 30 Jan 2017
Dear Anthony,
How likely do you think is a bug in such a fundamental Matlab function? We have 96'559 participators in this forum currently and 7447 people have published functions in the FileExchange. Therefore I'm convinced, that there are at least 100'000 Matlab users (an extremely pessimistic estimation). During the development and testing of Matlab such a bug would have been found and if not, any of the users had reported it already.
Azzi's idea is most likely correct and "sum" is one of the most frequently shadowed built-in functions. But a redefined horzcat command could be the problem also.
Whenever such a magic behavior occurs, checking the user-defined parts is a good idea. It is typical, that such problems disappear magically after a restart of the computer or of Matlab. But this does not indicate, that the computer of Matlab caused the problem. It is the typical nature (or even the definition) of magic: Humen see relations between unrelated events.
Welcome to the forum have have fun with Matlab!
3 Comments
Image Analyst
on 30 Jan 2017
To find out which, if any, of your m-files overload the built-in MATLAB functions, see the attached program.
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