Hi Stéphane
It looks very nice and I hope it will be added to Scilab as proposed by
your code review. Why does it say in red print "Cannot Merge" ?
/Claus
On 16-03-2021 17:45, Stéphane Mottelet wrote:
Hi
For real life signals you should rather use something like this
(Savitsky-Golay filters)
https://codereview.scilab.org/#/c/21499/
S.
Le 16/03/2021 à 17:09, CHEZE David 227480 a écrit :
Hi Clément,
Thank you for your quick reply and solution ! Actually it’s working
for simple data but with noisy experimental timeseries, some
filtering is required to get perfect regular signal (between the
‘true’ extrema) that could be then managed by the routine. I suppose
this is something the Matlab/Octave is handling internally, with some
parameters as function’s argument to tune it, maybe it’s not the case .
Regards,
David
*De :* users <users-boun...@lists.scilab.org> *De la part de* Clément
David
*Envoyé :* mardi 16 mars 2021 16:27
*À :* Users mailing list for Scilab <users@lists.scilab.org>
*Objet :* Re: [Scilab-users] find and locate local maxima
Hello David,
After reading the Matlab documentation page, it seems pretty simple
to implement using Scilab : and $ symbols:
function[*pks*, *locs*]=_findpeaks_(*data*)
ii = find(d(1:$-2) < d(2:$-1) & d(2:$-1) >= d(3:$));
*pks* = *data*(ii+2);
*locs* = ii + 2;
endfunction
data= [25 8 15 5 6 10 10 3 1 20 7];
_plot_(data)
[pks,locs]= _findpeaks_(data);
_plot_(locs,pks, 'xr');
Note: using oct2py and pims might also be an option for simple cases
but these wrappers are complex to use and data need to be copied at
language boundaries.
Regards,
Clément
*From:*users <users-boun...@lists.scilab.org
<mailto:users-boun...@lists.scilab.org>> *On Behalf Of *CHEZE David
227480
*Sent:* Tuesday, March 16, 2021 2:53 PM
*To:* Users mailing list for Scilab <users@lists.scilab.org
<mailto:users@lists.scilab.org>>
*Subject:* [Scilab-users] find and locate local maxima
Hi all,
I’m looking for function that could find and locate every local
maxima of any discrete time signal (timeseries), similar to Matlab or
Octave function findpeaks(), scipy find_peaks(). Is anyone aware if
something similar is already available in Scilab ? (I already browsed
a little bit and it don’t seem so…)
If not in Scilab macros, any hint to use the Octave or scipy function
directly from Scilab?
More globally it seems that Octave Forge could be linked with Python
(from oct2py import octave
# Load the Octage-Forge signal package.
octave.eval("pkg load signal")), does someone ever tried to bridge
similarly in Scilab ? oct2sci
Kind regards,
David
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--
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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