How to use the SUM() function..?

Hello,

I must be doing something very stupid here, as I can't get the sum() function to work at all;

X = [0 0.5 1 1.5 2 2.5]
sum(X(1,:))

From what I've read, this should sum all the element of row 1 of the matrix X and return a numerical result, but when I try it, I get the error:

Array indices must be positive integers or logical values.

Can anybody tell me what I'm doing wrong, please?

Thanks,

Paul

Answer 1

[Bruno Luong]

You overshadow sum function

make sure to run

clear sum

before runing your code

[paul]

...As is so often the way, I almost instantly found the problem after bashing my head against it and then posting my question...

I cleared all my workspace variables and suddenly sum(0 started working, so there must have been something in there which was stopping sum() from working...

Thanks to anybody who was thinking about this for me,

Paul

[paul]

Thanks very much :)

Answer 2

[Torsten]

Did you create a MATLAB function with name sum.m ? If yes, rename it.