problem with sum command

when i use sum(a), while the elements of 'a' are not integer, i got this error:Subscript indices must either be real positive integers or logicals. what is the problem?

Answer 1

[Wayne King]

You must have a variable in your workspace called sum, which is a bad idea.

Make sure that your program or script does not create a variable called sum.

If you enter,

>>which sum

You'll see

sum is a variable.

Enter

clearvars sum

Then try to use sum() again. You should avoid creating variables that have the same name as functions you want to use.