Plot 3d graphs of a 2D gaussian function
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Hello, I have two gaussian variables and their probabilities.
The number of points is limited to 200 and I want to plot the probability on a 3D graph but I cannot succeed in get what I want. I have followed http://www.mathworks.com/matlabcentral/answers/220-3d-plot-from-imported-excel-data which is great but my output do not work. I wanted to have something with surf like http://upload.wikimedia.org/wikipedia/commons/c/ce/Gaussian_2d.png.
I attach my txt file content, if someone can give a suggestion or an idea how to solve it. Take into account that 1/4 of the gaussian is cut because of unphysical condition in that area.
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0 个评论
采纳的回答
Andrew Newell
2011-7-17
If the above data are copied into a file 2dGaussianData.dat, the following code can give you the surface you want:
A = importdata('2dGaussianData.dat');
x = A(:,1); y = A(:,2); z = A(:,3);
Your data are not on a regular grid (although they start out looking like they are), so you need to interpolate:
F = TriScatteredInterp(x,y,z);
Now define the grid for plotting your surface:
qx = linspace(min(x),max(x),100); % define your grid here
qy = linspace(min(y),max(y),100);
[qx,qy] = meshgrid(qx,qy);
Finally, calculate the interpolating surface and plot it.
qz = F(qx,qy);
h = surfc(qx,qy,qz,'LineStyle','none');
If you'd like to see where your data lie on this surface, you can add the following commands:
hold on;
plot3(x,y,z,'k.')
2 个评论
AYUSH SINGHAL
2020-3-14
i don't have an equation for a 2D curve but have points which i have attached herewith.
now i want to plot this curve in 3D, with similar kind of variation in y axis as well.
can you suggest a way to do this??
更多回答(2 个)
Sumit Kushwaha
2017-6-29
I have gray scale noisy image (2-D). I want to plot Gaussian PDF for this 2-D gray scale noisy image in MATLAB. Please help
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