Plot 3d graphs of a 2D gaussian function

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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Answer 1

[Andrew Newell]

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.')

[AYUSH SINGHAL]

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??

[Wolfgang]

F= TriScatteredInterp does not work in my case. the function is known.

Answer 2

[mortain]

Thank you very much, it is working in a wonderful manner!

I have understood how it works....

Answer 3

[Sumit Kushwaha]

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

[Andrew Newell]

Note: This question was also asked here.