How to add the formula below into FEKO or HFSS?

How to add the formula below into FEKO or HFSS?
Need to use Mathlab?


θ = cos-1([Φ/2Npie] -1) where 2Npie ≤ Φ ≤ 4 Npie
Set N = 3.

Please help

Try the following expression: if(cond-exp, true-exp, false-exp) in HFSS.

Thanks streamlet for your contribution.
I will try.
Cheers
Kiat

Hello, You can also do it on FEKO. The equations with conditions are easier to enter on prefeko codes. You can enter the equation qith the condition if(...) before and endif after. In CADFEKO it'as not available yet.