# How to find minimum of a 3D function in a double for loop plotted on a slice?

1 view (last 30 days)
Wiqas Ahmad on 20 Apr 2022
Commented: Wiqas Ahmad on 20 Apr 2022
I have 24 subplots of a 3D function (costf) plotted on a slice using two forloops,h and fov, as: The program is:
figure
count = 1;
for h = 1000:1000:4000
for fov = [0.2, 0.5, 1, 2, 5, 10]
H = genHeight(h);
a = 0.01:0.01:0.05;
r = 4:20;
[X, Y, Z] = meshgrid(r, a, H);
xslice = r;
yslice = a;
zslice = H;
subplot(6, 4, count)
slice(X, Y, Z,costf, xslice, yslice, zslice)
hCB=colorbar
hCB.Label.String='Cost function';
xlabel('CER_{ref}(\mum)')
ylabel('\alpha_{ref}(1/m)')
xlim([4, 20])
zlabel('Height(m)')
view([-221.831289102975 32.404205593246]);
count = count + 1;
end
end
I want to find the minimum value of the function "costf" in each loop, alternatively in each subplot and spot the minimum value in each subplot with asterisk. My cost function is a 3d function with dimensions, as: Matt J on 20 Apr 2022
Edited: Matt J on 20 Apr 2022
figure
count = 1;
for h = 1000:1000:4000
for fov = [0.2, 0.5, 1, 2, 5, 10]
....
tf=costf==min(costf(:));
hold on
scatter3(X(tf),Y(tf),Z(tf),'*')
hold off
end
end
Wiqas Ahmad on 20 Apr 2022
@Matt JThank you so much, Sir