Question

13.2 A quadratic Julia set has the form

z(n+1)=z(n)^2+c

The special case where c=-.123+.745i is called Douday's rabbit fractal. Follow example 13.1, and create an image using this value of c. For the Madelbrot image, we started with all z-values equal to 0. You'll need to start with z=x+yi. Let both x and y vary from -1.5 to 1.5.

I'm really confused by this question. Here's my attempt at a solution. I really hope someone can help me. My book did a very bad explaining the matter.

Code:
>> iterations=80;
grid_size=500;
[x,y]=meshgrid(linspace(-1.5,1.5,grid_size),linspace(-1.5,1.5,grid_size));
c=-.123+.745*i;
z=x+y*i;
map=x+y*i;
for k=1:iterations
z=z.^2+c;
a=find(abs(z)>sqrt(5));
map(a)=k;
end
figure(1)
image(map)
colormap(jet)
??? Error using ==> image
Error using ==> image
Image CData can not be complex

Answer 1

See
http://www.jiskha.com/display.cgi?id=1310887564