Re: [Scilab-users] Frequency response

2018-09-14 Thread Samuel Gougeon

Le 14/09/2018 à 20:57, Claus Futtrup a écrit :


Dear Scilabers

I have calculated an impulse response and wish to do an FFT to achieve 
the frequency response. I know what to expect. In the matlab forum 
someone asked the same question and was recommended to use freqz ... I 
wonder what would be the equivalent function in Scilab?


https://www.mathworks.com/matlabcentral/answers/350350-how-to-plot-loudspeaker-frequency-response-from-its-impulse-response 



For example, to replicate the code snippet (second answer in above 
link), how to do this in Scilab?


h = rand(1,64); // impulse response (Matlab source code)
fs = 1000;
Nfft = 128;
[H,F] = freqz(h,1,Nfft,fs);


Did you have a look around freq() or repfreq()?

We have somewhat the equivalence invfreqz(H,F,m,n,W) <=> frfit(F*2*%pi, 
H, n, W) // Scilab


So you may look for the reciprocal of Scilab's frfit()

HTH
Samuel

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[Scilab-users] Frequency response

2018-09-14 Thread Claus Futtrup

Dear Scilabers

I have calculated an impulse response and wish to do an FFT to achieve 
the frequency response. I know what to expect. In the matlab forum 
someone asked the same question and was recommended to use freqz ... I 
wonder what would be the equivalent function in Scilab?


https://www.mathworks.com/matlabcentral/answers/350350-how-to-plot-loudspeaker-frequency-response-from-its-impulse-response 



For example, to replicate the code snippet (second answer in above 
link), how to do this in Scilab?


h = rand(1,64); // impulse response (Matlab source code)
fs = 1000;
Nfft = 128;
[H,F] = freqz(h,1,Nfft,fs);
semilogx(F,mag2db(abs(H))); grid on;
xlabel('Frequency (Hz)'); ylabel('Magnitude (dB)');

Best regards,

Claus



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[Scilab-users] algebra conventions with integer types to be discussed

2018-09-14 Thread Stéphane Mottelet

Hello all,

Integer types in Scilab are not smoothly implemented and there are still 
some bugs and real questions to be discussed, specifically on 
over/underflow, exceptions in divisions such as in


int8(1)/int8(0)

int8(-128)/int8(-1)

type of the result of mixed double/integer operations, such as

int8(1) + %pi

int8(1)/0.0

and so on. Other software related to Scilab, e.g. Matlab and Julia, have 
different conventions and currently Scilab currently adopts a mix of 
them, which does not help to make one's mind.


Integers types were a long-waited feature by people who needed it, so I 
would like to have some  developpers and user testimonies about the way 
they do algebra with them.


Thanks in adavance,

S.

--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet

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Re: [Scilab-users] xload vs load

2018-09-14 Thread amonmayr

Hi all,

I found a way to reproducibly trigger the bug, and reported it here : 
https://bugzilla.scilab.org/show_bug.cgi?id=15765

Can you try the sample script on the example graphic file?

Cheers,

Antoine

--
+++

 Antoine Monmayrant LAAS - CNRS
 7 avenue du Colonel Roche
 BP 54200
 31031 TOULOUSE Cedex 4
 FRANCE

 Tel:+33 5 61 33 64 59
 
 email : antoine.monmayr...@laas.fr

 permanent email : antoine.monmayr...@polytechnique.org

+++

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[Scilab-users] xload vs load

2018-09-14 Thread antoine . monmayrant

Hi all,

am I the only one to experience that xload is completely broken an can 
be replaced by load?
I am trying to reload slightly complex figures (that is with more than 
one plot per figure) and xload is almost always failing in some way.
For example, one of my figure as 3 plots and I can see all three while 
the graphic window is being populated, but in the end, the first subplot 
sometimes disappears (it's not visible="off", it's gone).

Anyone has experienced something similar?
If I can find a way to get this to reproducible, I'll try to fill in a 
bug report...


Antoine

--
+++

 Antoine Monmayrant LAAS - CNRS
 7 avenue du Colonel Roche
 BP 54200
 31031 TOULOUSE Cedex 4
 FRANCE

 Tel:+33 5 61 33 64 59
 
 email : antoine.monmayr...@laas.fr

 permanent email : antoine.monmayr...@polytechnique.org

+++

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