u cannot use 'mean',if not use 3.5,for instance 3.2 3.3
u should use interp1
my answer https://blog.csdn.net/qq_44846756/article/details/116567963

@arsenic, your comment on the main post is deleted because it revealed the answer. It is not the best practice to do so.

A

I couldn't remember interp1 but I formed a very silly code to do the same

Absolutely for the tests...

For convenience, it would be useful if the code input variables were related to the variables listed in the solution window. We are given a, b, alpha, and beta in the Test Suite; the function that we are to type involves vb, va, a, and b. Sure, we can update it, but it just seems careless.

good

good

this won't work when the point is not in middle of 2 elements, for example a=3.3 in test 1