How to fit linear plateau equation ?
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
madhuri dubey
le 8 Déc 2018
Commenté : Bruno Luong
le 10 Déc 2018
I want to fit linear equation with plateau condition.
y=a(x+n)+b
These are the data in which I Want to fit:
x=[0,80,100,120,150],
y=[1865,3608,4057,4343,4389]
I don not know how to find the plateau value of yield.
3 commentaires
Réponse acceptée
Bruno Luong
le 10 Déc 2018
Modifié(e) : Bruno Luong
le 10 Déc 2018
You can use this FEX file (BSFK)
The code is by default use QUADPROG from MATLAB, but can also work with QPAS project by Adrian Wills for user who has not access to optimization toolbox as showed below:
x=[0,40,80,100,120,150,170,200];
y=[1865,2855,3608,4057,4343,4389,4415,4478];
opt = struct('KnotRemoval','none','sigma',1,'qpengine','qpas');
pp = BSFK(x,y,2,2,[],opt);
% prepare graphical data
xi = linspace(min(x),max(x));
yi = ppval(pp,xi);
xb = pp.breaks(2);
yb = ppval(pp,xb);
clf
plot(x,y,'or',xi,yi,'-b');
xline(pp.breaks(2));
text(xb,yb,sprintf('(%g,%g)',xb,yb));
3 commentaires
John D'Errico
le 10 Déc 2018
Note that the upper line segment is not held constant in your solution, as it seems the OP wants.
Bruno Luong
le 10 Déc 2018
I don't know exactly what he wants, I did not follow the thread closely.
I give the code if he is not happy then I hope he'll come back with further request.
If the plateau must be constant I can enfore the derivative to 0.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Solver Outputs and Iterative Display dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!