Re: [Qucs-devel] Re: Question

[Stefan J. <st...@gr...>]

On Fr, 29.07.2005, 08:23, Mic...@al... wrote:

> Hello,

Hi!

>>>>> Concerning the point 2, I will try to elaborate: I need to simulate
>>>>> a coil L(I) where the value of
>>>>> the coil depends on the value of a current calculated in the
>>>>> circuit. How do I make it with the equation module?
>>>>
>>>> I just want to clarify my TODO list item.  So I ask who listens:
>>>>
>>>> It is straight forward to implement a feature which enables qucsator
>>>> to
>>>> take a equation variable's content and fill it into the property of
>>>> some component if:
>>>>
>>>>   1) the variable is a constant (the result)
>>>>   2) the variable depends on a sweep variable
>>>>   3) the variable depends on another components property
>>>>
>>>> But problems occur (as in the above mentioned case) when
>>>>
>>>>   4) the variable depends on another components operating point
>>>>   5) the variable depends on a simulation result (e.g. node voltage
>>>>      or branch current)
>>>>
>>>> Is it necessary for these two cases to simulate, apply property,
>>>> simulate, apply property, simulate, etc. ... until no (or little)
>>>> change in simulation results occurs?  We need to repeat single
>>>> simulations until results converge?  Or am I on the wrong track?
>>>>
>>>> Please help me clarifying!
>>>>
>>>> Thanks in advance,
>>>>   Stefan.
>>>
>>> I would like to put in my opinion on that issue:
>>> I think the above-mentioned method is not very usefull!
>>
>> But points 1) through 3) may be useful?
>
> Yes, indeed. But could lead to infinite recursion.

Can you give an example?

In fact the equation solver finds out about recursions, e.g.

  a=1
  b=2+a
  c=3-d
  d=c

is detected, and an appropriate error message thrown...

Stefan.