gooliver said:

what's the method in object?

I know the nodal potential method for a electrical

network linear time-invariant... but I've read than

the nodal potential modified method is the method which

SPICE use for the solution...

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thanks for suggestions

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Nodal vs loop solutions generally mean fewer equations to solve. In

addition, it is relatively easy to input circuit data from a table and the

process is well suited to a standard algorithm to build the admittance

matrix. (loop analysis requires making choices -not so good for the idiot

box and not standardised for every circuit).

As long as the circuit is linear- no problem. If non-linear, then it becomes

a step by step situation- solve a linear model, modify for non-linearities

and repeat until, hopefully, convergence occurs.

I've not used SPICE but I expect that the above are the basic reasons for

its use.

I do know that nodal analysis is the standard for power system load flows

and stability studies which are larger than anything that SPICE would be

expected to handle (often several thousand non-linear simultaneous

equations for the load flow and for stability, this is done at each step of

the solution of a large set of non-linear differential equations)