LTSpice "Unknown parameter "\""

Question

I am trying to simulate an electrical model (Mason Model) of piezoelectric system in LTSpice. So, I use parameters and formulas to evaluate the value of the passive elements in my circuit.

I use the following eq. for one of my capacitor:

C = {Zo}\{cos({Tou}*{t})}

which returns an error saying:

Error on line 9 : c3 p001 n007  63262.1256016315 \ 0.876872546720567 
 Unknown parameter "\"

I also use 1/{f} for calculating the on time of my pulse signal but that seems to work just fine. Am I missing to define a library?

Answer 1

Change your \ to a / if you want to do division.

As far as I know, \ has no meaning in LTSpice, so it's not surprising it gives an error message about something being "unknown" when you use this symbol.

Edit

Based on comments, the actual problem is that the expression must be surrounded by { and }.