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GLAPLACE XFORM Syntax Recommendation

cabala

Hi all, I am looking to see if anyone has a recommendation on how to enter this s-domain polynomial into the XFORM property field more compactly? 

(1.76633807e-28*s*s*s*s*s*s*s + 4.37752348e-24*s*s*s*s*s*s + 2.21287946e-20*s*s*s*s*s + 1.63859923e-16*s*s*s*s + 4.51408684e-13*s*s*s + 1.45284939e-9*s*s + 1.42274997e-6*s + 1.19109226e-3) / (-2.49510738e-29*s*s*s*s*s*s*s*s + 3.28470008e-24*s*s*s*s*s*s*s + 1.36672855e-20*s*s*s*s*s*s + 2.41372502e-16*s*s*s*s*s + 6.79605490e-13*s*s*s*s + 4.23416528e-9*s*s*s + 6.15007649e-6*s*s + 6.30604299e-3*s + 1)

It's an 8th order polynomial curve fit for an impedance model. It has been tested and works. 

I tried to create .PARAM statement in an include file for "num" and "den" but it didn't like the 's' variable which makes sense but the above is super cumbersome. Is there a way to define other properties and have XFORM reference that?

Thanks!

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  • IshaS
    0

    Hi,

    Are you using the expression in single line?

    Can you share snippit how you created PARAM Statement.

  • cabala
    0 in reply to IshaS

    Yes currently, the expression shown above is one single line in the XFORM property of the GLAPLACE part property spreadsheet. 

    For the .PARAM statement it simply looked like this:

    .PARAM num = {1.76633807e-28*s*s*s*s*s*s*s + 4.37752348e-24*s*s*s*s*s*s...}

    And the same for den. Then in XFORM I tried to use 'num/den' but upon compile I got an error about the 's' Laplace parameter not allowed or something. 

    I realize part of the problem is I have the XFORM property as visible which makes moving the part around a giant pain. I guess I can just hide the property field for now. Just would be nice if there was simpler way to input that expression. 

  • IshaS
    0 in reply to cabala

    Can you share a snapshot how you are using it.

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  • IshaS
    0 in reply to cabala

    Can you share a snapshot how you are using it.

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