Subtracting polynomial from piecewise polynomial
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
Hello, I have a piecewise polynomial
and I want to subtract
from it. How would I go about doing this?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/962205/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/962210/image.png)
Thanks!
1 Commento
Riccardo Scorretti
il 12 Apr 2022
Hi Nathan, could you post part of your code? You have a polynomial in which format? Coefficients only? Symbolic?
Risposta accettata
Bruno Luong
il 12 Apr 2022
x=cumsum(rand(1,5));
x = x-mean(x);
% Test pp
y=rand(size(x));
pp=spline(x,y);
% Here is ppsubx2 a pp-form of pp-x^2
x0=pp.breaks(1:end-1)';
ppsubx2=pp;
ppsubx2.coefs = ppsubx2.coefs - [zeros(ppsubx2.pieces,ppsubx2.order-3), ones(size(x0)), 2*x0, x0.^2];
% Check
xi = linspace(min(x),max(x));
figure
plot(xi, ppval(pp,xi)-xi.^2, 'b', xi, ppval(ppsubx2,xi), 'r+');
0 Commenti
Più risposte (0)
Vedere anche
Categorie
Scopri di più su Polynomials in Help Center e File Exchange
Prodotti
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!