Hi Scott,

rho is a constant  (liquid density) which value is already specified. You can see that in eq. (2) it does not appear anymore  because its value has already been computed.

Dear Edgar,

thank you for your suggestion. Actually,when needed I usually do something like that, but I was wondering if someone knows how to do it, for example, in the same way we do in MATLAB.

Luciane.

Dear Alex,

thanks for your suggestion. I believe that is the aswer for my problem.