"Vector must be strictly increasing or strictly decreasing with no repeated values" error
17 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Michael Elman
am 31 Aug. 2020
Bearbeitet: Michael Elman
am 1 Sep. 2020
Hello,
I'm trying to use contour to represent some data, but I get this error.
Thank you in advance.
R_a=3;
N=100;
phi=linspace(0,2*pi,N);
rho= linspace(0,R_a,N);
r = randi([50 70],1,length(rho));
A=ones(length(rho)).*r;
[x_c,y_c] = pol2cart(phi,rho);
[Ro_tag, Phi_tag]=meshgrid(rho,phi);
contour(x_c,y_c,A);
4 Kommentare
Akzeptierte Antwort
Matt J
am 31 Aug. 2020
Bearbeitet: Matt J
am 31 Aug. 2020
Your meshgrid must be Cartesian:
R_a=3;
N=100;
[X,Y]=meshgrid( linspace(-R_a,+R_a, N) );
[Phi,Rho]=cart2pol(X,Y);
A= ... computaton based on Phi and Rho ...
contour(X,Y,A);
3 Kommentare
Matt J
am 31 Aug. 2020
Bearbeitet: Matt J
am 31 Aug. 2020
Very well, then I modify my answer to,
R_a=3;
N=100;
[X,Y]=meshgrid( linspace(-R_a,+R_a, N) );
A= ... computaton based on X and Y ...
contour(X,Y,A);
The point is, A needs to be sampled on a normal Cartesian meshgrid for the purposes of doing the contour plot. You cannot, as a starting point, set up your sample locations in polar coordinates because they will not remain monotonic when transformed by pol2cart().
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Polar Plots finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!