Re: [Maxima-discuss] linear circuit analysis example?

[Nicholas J. <jan...@as...>]

Ok, so you're looking to do nodal finite element assembly with analytical
impedance matrices to output a global impedance matrix?


On Jan 22, 2018 6:24 PM, "Henry Baker" <hb...@pi...> wrote:

Well, perhaps the correct answer should be to ask for a Spice
file format reader for Maxima.

The input format is completely trivial; the various nodes on
the electrical diagram are labelled with distinct integers;
"ground" is given the zero ("0") node label.

A 1.0 micro-farad capacitor from node 3 to node 5 has the following
line in the file:

C13 3 5 1.0e-6

You couldn't ask for a simpler file format.

The output from such a Spice file reader would be a
Laplace polynomial in s: "10*s" in the appropriate
matrix entries (or perhaps 1/(10*s), depending upon
the representation).

At 01:45 PM 1/22/2018, Achim Gratz wrote:
>Sidney Marshall writes:
>> I'm still not sure what you are looking for. I have never heard of the
>> expression "stamp".  but it seems appropriate.
>
>In some publications it's called a stencil.
>
>In any case, I think the original publications to look for in relation
>to the methods that the OP was likely referring to are from the 50s or
>even earlier, before the advent of numeric computing.  There were quite
>a few methods that allowed to manipulate circuits either in matrix form
>or as graphs (which can be written out in matrix form if needed) to
>arrive at something that was either easier to solve than the original or
>would use a different set of circuit elements to ease actual
>implementation.  The graph methods (for instance Mason graphs) generally do
>a better job of preserving the topology of the original circuit if
>that's what you're after.  The contemporary extension of these efforts
>goes under the name "symbolic circuit analysis", although I think there
>is a greater focus on closed-form expressions and less on circuit
>manipulations these days.
>
>Regards,
>Achim.
>--
>+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
>
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