On 1/6/2009 12:53:17 PM, mark_neil wrote:
>stv: thanks. It works in the
>way that you indicated.
>Alvaro: The last condition in
>your file implies that the
>imaginary part of the left
>hand side is zero and its real
>part is equal to 1. You set
>the angle of the complex
>number to zero. Therefore,
>MathCad generated complex
>numbers as solutions for some
>of the parameters. All
>parameters of the solution
>should be real numbers. I am
>looking for the solution that
>satisfies the "module" of the
>left hand side is equal to 1
>with a non-zero imaginery
>part.
I know that, but because you're looking only for R and C values, they are reals, giving up the correct real values (if the unknow is f, or some L's or Z's, this method fail, but isn't the case). You can check this with the second method, using the user defined Mag function, that the answer is the same. (This is the reasson to I include this check at the end).
>Also, it looks like it is the
>symbolic solution that
>necessitates manipulation of
>the equations/conditions for
>MC14 to solve them. if I use
>numeric solution instead, does
>it mean that MC14 wouldn't
>require manipulation of the
>conditions?
>
> Mark.
For numerical solution I prefer to reescale the problem, according with the values of TOL (valuing C in pF, for example). Guess values are part of the Given-Find statment, and usually needs to be pretty good ones.
Alvaro.