Calculate - Mismatched brackets error

Question

I have a pretty complicated self scoring survey123 form, and I'm getting a mismatched brackets error for an equation that seems to not have mismatched brackets.

1/(1+(pow(2.718,(10*(${InletPerchLow}-0.5))))

When I change to the following, I get an unexpected beginning of path.

1/(1+pow((2.718,(10*(${InletPerchLow}-0.5)))))

Any advice would be great!

KathleenHoenke · Answer

Thank you! It appears that division has to be represented by "div" in the XLS form. I changed it to div and added the bracket you suggested and it worked!

jcarlson · Answer

I broke it out step by step, and it appears that it's the "1 / " that is the problem. Instead, try using this:

pow((1+pow((2.718,(10*(${InletPerchLow}-0.5))))), -1)

It's mathematically equivalent, but Survey123 seems to not have a problem with doing it this way.

KathleenHoenke · Answer

Thank you! When I add one on the end, then I receive the error:  Unexpected beginning of Path in expression