Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

Question

0 个投票

Hey guys

I've written some code to compute cost function at various theta, as follows:

h = X * theta;

J = [1/(2*m)] * sum[(h-y).^2];

All variables have been defined. Upon running the code above, I'm getting the following error message:

Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

I have no experience with Matlab, so any help would be appreciated!

Thanks

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

Answer 1

Rajanya 2025-3-18

0 个投票

'sum' is a function and needs to be called with parentheses (not square brackets [.]) -

sum((h-y).^2)

Thanks.

Stephen23 2025-3-18