sum function not working

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Anthony
Anthony 2013-9-11
评论： Osama 2023-2-27
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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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-9-11
编辑：Azzi Abdelmalek 2013-9-11
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])

更多回答（2 个）

Jan
Jan 2013-9-12
编辑：Jan 2017-1-30
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!
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Jan
Jan 2013-9-12
Yes, Anthony, peace!

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Image Analyst
Image Analyst 2017-1-30
To find out which, if any, of your m-files overload the built-in MATLAB functions, see the attached program.

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