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.
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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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