Creating 3D plot from a n*n matrix

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DONGUK KIM
DONGUK KIM 2020-5-1
编辑： Ameer Hamza 2020-5-1
I wanted to create a 3D plot from a 100*100 matrix, with two other vectors with length 100 that serves as the axis for the plot.
This was the code that I wrote but the most of it is just defining the main matrix, the important part is at the bottom where its supposed to make the 3D plot.
N = 100;
ka = linspace(0,0.99,100);
pa = linspace(0,pi/2,100);
K = zeros(N,1);
E = zeros(N,1);
for i = 1:N
for n = 1:N
k = ka(i);
p = pa(n);
funK=@(t)(1-(k^2)*(sin(t)).^2).^(-0.5);
Kf=@(x)integral(funK,0,x);
K(i,n) = Kf(p);
funE=@(t)(1-(k^2)*(sin(t)).^2).^(0.5);
Ef=@(x)integral(funE,0,x);
E(i,n) = Ef(p);
end
end
[ka,pa] = meshgrid(ka,pa);
%hold on
surf(ka,pa,K);
surf(ka,pa,E);
%hold off
Error says that the dimensions differ (for surf() )
Is there any way to fix this?
Thanks
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DONGUK KIM
DONGUK KIM 2020-5-1
Sadly this was what I got from including hold on & hold off
Without hold on it returns one of the surfs fine.
Any reason why this might be happening?
Thanks.
KSSV
KSSV 2020-5-1
What are you expecting actually?

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-5-1
编辑：Ameer Hamza 2020-5-1
'hold on', fix the view of the axes. You can explicitly specify to see the 3D view. Change the line at the end of your code like this
hold on
view(3) % add this line for 3D view
surf(ka,pa,K);
surf(ka,pa,E);
% shading interp % this line is optional, just to make the surface looks more clear
hold off

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