Eval and environments in R: Why can't Eval() find a variable defined in the environment where it evaluates the expression

Question

I have a question concerning environments in evaluating expressions. Specifically, I have a function bnlearn::cpdist that takes a logical expression as an argument. I wish to

Answer 1

I had an issue like this. I solved it with super assignation on the variable that was not found in my function.

var <<- 5