MATLAB: Fractal_explorer problems

fractalfractal_explorergui

I recently installed my Matlab 7.0.0.27 R14 on my new Windows 7 Home Premium machine (Dell Inspiron 560). After replacing the java rte folder in the proper directory, the script fractal_explorer.m runs, but I don't know how to enter user input for the menu-selectable fractal functions requiring user input. Instead of a dialogue box, it shows me a figure descibing the parameters, but it doesn't allow input.

Has anyone used this code that could lend some advice?

Many thanks, Jeff J

Best Answer

The R14* versions of MATLAB are not supported for Windows 7, and are not expected to work on Windows 7 even under XP emulation mode. R2006a is the first version that is thought to be plausible to get to work under Windows 7 (or so I gather from past postings.)

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MATLAB: Fractal in MATLAB

The key point you are missing is that you need to feed in the coordinates of the endpoints as well as n. That will allow you to recursively call cartoon for each subinterval. Here is a code that will do what you want:

function [x,y]=cartoon(x,y,n,H)
if nargin < 3
  n = 4;
end
if nargin < 4
  H = 1/2; % Hurst's exponent
end
% If n <=0, x and y are equal to the input.
if n > 0
    % Create the first division.
    x = x(1) + (x(2)-x(1))*[0 4/9 5/9 1];
    y = y(1) + (y(2)-y(1))*[0 2/3 2/3*H 1];
    % Subdivide each interval recursively.
    [x1,y1] = cartoon(x(1:2),y(1:2),n-1,H);
    [x2,y2] = cartoon(x(2:3),y(2:3),n-1,H);
    [x3,y3] = cartoon(x(3:4),y(3:4),n-1,H);
    % The vectors x1,x2,x3 overlap at their endpoints.
    x = [x1 x2(2:end) x3(2:end)];
    y = [y1 y2(2:end) y3(2:end)];
end

Note that I have also removed the plot command from inside the function. You can now recreate the left plot using a loop like this:

 for i=1:4
    subplot(4,1,i)
    [x,y] = cartoon([0 1],[0 1],i,1/2);
    plot(x,y)
end

For the right hand plots, you'll need to run cartoon on each of the two line segments and piece the results together.

MATLAB: Petrosian fractal entropy estimation

Hi,

you can use a function handle to do this:

PFD = @(N,M) log10(N)/ (log10(N) + log10(N/(N + 0.4*M)))

To calculate values with this use either:

example_result = PFD(3,5)

or use variables:

N = 3
M = 5
Example2 = PFD(N,M)

Both give you the same result.

Best regards

Stephan

Best Answer

Related Solutions

MATLAB: Fractal in MATLAB

MATLAB: Petrosian fractal entropy estimation

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