[Question][Hw0-2] Sigma function of calculator.ml

[adzaky15]

Name: Akhdan Dzaky Maulana

Hello!
I'm doing calculator.ml, and I got stuck on the Sigma(e1, e2, e3) -> part.

Should I add "env" map to the calculator? Or should I find a way to convert e3 into a function?

[pingpingy1]

I think you can write a helper function that takes the environment into account, and then use it inside the calculator function.

[ICubE-]

There would be two solutions:

1. Make a helper function that has an environment argument calc_aux (expr) (env) and save the value of X in the environment.
2. Since only one variable named X exists, substitute all X in e3, except for internal sigma.

First one is more general solution, but second one is easier to implement.

[bongjunj]

I did it iterating all possible values of X when evaluating Sigma expression. :)

[KihongHeo]

@adzaky15 does the above comments solve your problem? Please close this issue if so.