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Matlab 3D problem

  1. Mar 30, 2008 #1
    1. The problem statement, all variables and given/known data
    Hi all! I'm trying to solve the following problem but I'm not too sure of a few things.
    Write Matlab instructions to plot a three dimensional Gaussian:

    A = A0exp((x^2 + y^2 + z^2)/w^2)

    choosing appropriate values for A0,w and range of coordinates.


    2. Relevant equations
    I'm guessing i have to use the plot3 command but after that I'm lost


    3. The attempt at a solution
    I dont know how to choose appropriate values for all of the variables.And what is w?
    I'm a bit lost so I'd really appreciate any hints or tips to point me in the right direction thanks debs:smile:
     
  2. jcsd
  3. Mar 31, 2008 #2
    w is a parameter of your Gaussian, make it bigger and the distribution should flatten out.

    What exactly do you want to plot? You can't plot A(x,y,z) on a 3D plot because A depends on 3 variables so you would need a 4D plot.

    If you want to plot a Gaussian distribution of 2 variables, run the following code in Matlab:
    Code (Text):

    clear;
    pts = -5:.1:5;
    N = length(pts);
    X = reshape(repmat(pts,1,N),N,N);
    Y = reshape(repmat(pts,N,1),N,N);
    Z = exp(-X.^2-Y.^2);
    figure;surf(X,Y,Z)
     
    Is that the type of plot you are trying to produce?
     
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