Daniel Stringari 
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Hello Daniel, There can be different answers depending on what you are trying
to obtain at the end. Do you need to smooth curves by themselves, or are you somewhat
trying to build a smooth surface based on isovalue curves (your
TORQUE X SPEED curve ?) ? In this latter case, can you provide the efficiency value associated to each TORQUE X SPEED curve ? In the former case, you need some ordering of your data, e.g. by
angle computed with center located at the mass center of points,
then least squares splines could be applied more efficiently. S. Le 07/04/2020 à 00:13, Daniel Stringari
a écrit :
 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 _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users 
Moreover, knowing if you are looking for closed curves (or not) would help. S. Le 12/04/2020 à 17:00, Stéphane
Mottelet a écrit :
 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 _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users 
The curve I would like to plot is similar to the one attached. There are
several efficiency curves within a SPEEDxTORQUE chart. My problem comes down to a spreadsheet generated by external software where I have three columns: SPEED, TORQUE and EFFICIENCY. The data is all broken and so I have to put an efficiency range to get data of just one efficiency. In this case, I created a function that runs through this matrix to collect the SPEEDxTORQUE data for efficiency (interval) and that is why I have several points nearby that could be reduced to just one. These vectors that I sent initially correspond to only one of these curves, if I'm not mistaken it's the 94% efficiency curve. I was observing the function of contour curves and I thought it would be possible to apply, since I will have to paint the graphic in the future. But I don't know how to do that yet. It is worth mentioning that the points vary according to the efficiency range, that is, it is not possible to predict how many SPEEDxTORQUE points I will have. <http://mailinglists.scilab.org/file/t498028/anexo1_1.png>  Sent from: http://mailinglists.scilab.org/ScilabusersMailingListsArchivesf2602246.html _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users 
The curve I have so far is summarized in the attachment below.
<http://mailinglists.scilab.org/file/t498028/annex_1.png>  Sent from: http://mailinglists.scilab.org/ScilabusersMailingListsArchivesf2602246.html _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users 
In reply to this post by Daniel Stringari
Hello,
You are taking the problem by the wrong tip. If I understand your problem, you have scattered (x,y,z) data (x=speed, y=torque, z=efficiency) and you want to approximate this data by a smooth surface z=f(x,y) and want to draw level curves of this surface. So, instead of focusing on curves first, you have to focus on the global approximation of the surface,and the level curves will be easy to determinate afterwards. So please provide your data (you can send it to me in a private message) if you want us to test different approaches. S. Le 14/04/2020 à 23:08, Daniel Stringari a écrit : > The curve I would like to plot is similar to the one attached. There are > several efficiency curves within a SPEEDxTORQUE chart. My problem comes down > to a spreadsheet generated by external software where I have three columns: > SPEED, TORQUE and EFFICIENCY. The data is all broken and so I have to put an > efficiency range to get data of just one efficiency. In this case, I created > a function that runs through this matrix to collect the SPEEDxTORQUE data > for efficiency (interval) and that is why I have several points nearby that > could be reduced to just one. These vectors that I sent initially correspond > to only one of these curves, if I'm not mistaken it's the 94% efficiency > curve. I was observing the function of contour curves and I thought it would > be possible to apply, since I will have to paint the graphic in the future. > But I don't know how to do that yet. It is worth mentioning that the points > vary according to the efficiency range, that is, it is not possible to > predict how many SPEEDxTORQUE points I will have. > > <https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/mailinglists.scilab.org/file/t498028/anexo1_1.png> > > > >  > Sent from: https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/mailinglists.scilab.org/ScilabusersMailingListsArchivesf2602246.html > _______________________________________________ > users mailing list > [hidden email] > https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users  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 _______________________________________________ users mailing list [hidden email] http://lists.scilab.org/mailman/listinfo/users 
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