How to mark the maximum of a surf plot

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Maria Anna
Maria Anna 2022-7-6
评论： Maria Anna 2022-7-6
Hello,
I want to mark the maximum of a surf plot, thats my code, but it isn't working and always puts out a false maximum:
alpha=50;
beta=20;
t=trnd(1,1,20);
x=alpha+beta*t;
a = linspace(35,65,1000);
b = linspace(-50,50,1000);
[a2,b2,x2] = meshgrid(a,b,x);
likeli=prod(b2./(pi*((x2-a2).^2+b2.^2)),3);
[maxV, maxL] = max(likeli(:));
[maxa, maxb] = ind2sub(size(likeli),maxL)
figure
contour(likeli,50)
hold on
axis auto
xline(maxa,'r')
yline(maxb,'r')
hold off

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采纳的回答

Karim
Karim 2022-7-6
Ran in:
I'm guessing you switched maxa and maxb. Note that the columns are plotted on the x axis and the rows on the y axis.
alpha=50;
beta=20;
t=trnd(1,1,20);
x=alpha+beta*t;
a = linspace(35,65,1000);
b = linspace(-50,50,1000);
[a2,b2,x2] = meshgrid(a,b,x);
likeli=prod(b2./(pi*((x2-a2).^2+b2.^2)),3);
[maxV, maxL] = max(likeli(:));
[maxa, maxb] = ind2sub(size(likeli),maxL)
maxa = 371
maxb = 359
figure
contour(likeli,50)
hold on
axis auto
xline(maxb,'r')
yline(maxa,'r')
hold off
% have a look in 3D
figure
surf(likeli,'EdgeColor','none')
hold on
axis auto
scatter3(maxb,maxa,maxV,50,'r','filled')
hold off
view(3)

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