Re: [Qucs-help] Fourier simulation

[Martin M. <mar...@gm...>]

Hello,

the Time2Freq(UoutP.Vt, time) function to set the x Axis as Frequency works
fine thank you!

Martin

2016-05-27 15:28 GMT+03:00 Claudio Girardi <cla...@vi...>:

> Hello Martin,
> a lazy solution is to use Time2Freq(UoutP.Vt, time) instead of
> fft(UoutP.Vt) , so the resulting vector will automatically have a
> dependence on frequency (and also the input need not to be a power of 2).
> There are surely other ways, but this is the easiest :)
>
> Hope this help,
> regards,
>   Claudio
>
> P.S.: in general please answer back to the list, the question/answer may
> be of help to other people
>
> ----Messaggio originale----
> Da: "Martin Marmsoler" <mar...@gm...>
> Data: 27-mag-2016 11.28 AM
> A: "Claudio Girardi"<cla...@vi...>
> Ogg: Re: [Qucs-help] Fourier simulation
>
>
> Hello Claudio,
>
> thank you for your fast respond. Sorry that I didn't see that fft has just
> one argument. How I can change the x Axis to calc them into a frequency?
>
> Martin
>
> 2016-05-27 13:17 GMT+03:00 Claudio Girardi <cla...@vi...>:
>
>> Hello Martin,
>> we currently have two Qucs version, the "classic" one, still named
>> "Qucs" and a derivative, named "spice4qucs" which can use an external
>> spice simulator to simulate a Qucs schematic.
>> The classic Qucs has a function named fft(), which takes just a single
>> argument; detail on the functions supported by Qucs are in the Help,
>> see Help -> Tutorials -> functions.pdf . Note that the number of points
>> of the argument must be a power of two.
>>
>> The help you were referring to is the part related to the "spice4qucs"
>> version, which can use some Spice functions.
>> The classic Qucs help is also at https://qucs-help.readthedocs.io/en/0.
>> 0.18/ .
>>
>> I have tried removing the second argument to the fft() function and
>> using 128 point in the transient simulations and got some results, if
>> they were correct I'll leave to you to check :)
>>
>> Regards,
>>   Claudio
>>
>>
>> >----Messaggio originale----
>> >Da: "Martin Marmsoler" <mar...@gm...>
>> >Data: 27-mag-2016 9.25 AM
>> >A: <quc...@li...>
>> >Ogg: [Qucs-help] Fourier simulation
>> >
>> >Hello,
>> >
>> >I tried to add the fourier function in qucs to plot this function.
>> But
>> >everytime I get the error that the variable time does not exist. Does
>> >anyone know how I can solve this?
>> >I found also a fourier simulation icon in the qucs help (
>> >https://qucs-help.readthedocs.io/en/spice4qucs/ASim.html#fourier-
>> simulation)
>> >but I don't find the icon in my simulations.
>> >
>> >I added the files and screenshot to google drive:
>> >https://drive.google.com/folderview?
>> id=0B_vrp_7db9bBNEQzNVZOeTliWFU&usp=sharing
>> >
>> >Hope someone can help me.
>> >
>> >Martin
>>
>>
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