how to draw contour error graph by using vector-like formation data

hi, i want to plot following graph by using 'contour' function in matlab.

here, i want to plot the cyclic coordinate optimizer's performance, which is used in align two images, shifting to x and y direction.

so in upper image, x is the x shift value, and y is y shift value, and z is error value.

and my x, y, z data is vector formation, so i don't know how to use matlab's 'contour' function by using these data.

how can i plot upper graph by using my vector data?

i appreciate all your help.

thanks a lot :))

Answer 1

[Voss]

% plot the contour
f = @(x,y)5*x.^2-6*x.*y+5*y.^2;
[X,Y] = meshgrid(linspace(-1.5,1.5,100));
contour(X,Y,f(X,Y),linspace(0.5,5,6),'k','ShowText','on')

% I don't know what form your x,y is in, so I use this
xy0 = [-0.5 -1];
dxy = [0 0.6; 0.25 0; 0 0.2; 0.15 0; 0 0.15; 0.05 0; 0 0.03; 0.03 0; 0 0.02; 0.02 0];
xy = xy0+[0 0; cumsum(dxy,1)];

% plot the red line from x,y
hold on
plot(xy(:,1),xy(:,2),'r')

[dayeon]

thank you so much! It really helped me!! :))

[Voss]

You're welcome!