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How to plot 3D pdf without meshgrid

8 次查看（过去 30 天）
N/A
N/A 2020-3-11
评论： N/A 2020-3-13
I need a 3D pdf plot without meshgrid.
I wrote this code but I don't know how to do it without meshgrid.
Can you help me please
mu=[0 1];
cov=[1 0.7; 0.7 2];
rng('default');
R = mvnrnd(mu,cov,10);
plot(R(:,1),R(:,2),'+');
x1 = -4:0.2:4;
x2 = -4:0.2:8;
[X1,X2] = meshgrid(x1,x2);
X = [X1(:) X2(:)];
y = mvnpdf(X,mu,cov);
y = reshape(y,length(x2),length(x1));
surf(x1,x2,y)
caxis([min(y(:))-0.5*range(y(:)),max(y(:))])
axis([-4 4 -4 8 0 0.15])
xlabel('x1')
ylabel('x2')
zlabel('Probability Density')

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回答（1 个）

darova
darova 2020-3-11
Without meshgrid
x = 1:3;
y = 1:4;
[X,Y] = meshgrid(x,y)
X1 = repmat(x,[length(y) 1])
Y1 = repmat(y(:),[1 length(x)])
Or you mean something else?
  1 个评论
N/A
N/A 2020-3-13
No, it doesn't give what I want. I need 3D surface as an output with my samples. Your code give just points.

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