% First of all select a range for the complex number C.

xi=-2;yi=-1;xj=0.5;yj=1;

% Define b x h grid of points.

b = 1024; h = 768;

% Now distribute the complex number C over the grid defined.

x = xi:(xj-xi)/(b-1):xj; y = yi:(yj-yi)/(h-1):yj;

% Grid of complex points.

[x,y] = meshgrid(x,y);

c = x + i*y;

z=zeros(h,b);

% Select the number of iterations.

iter = 100;

% Evaluate the (Z2 + C).

for k = 1:iter

z = z.*z + c;

end;

mandel = ones(h,b);

% If the point is in the Mandelbrot set.

mandel = mandel + ( abs(z) < 2 );

mandel = flipud(mandel);

% Define and plot the color map. This is for blue and black.

map = [ 0 0 0; 0 0 1 ];

image(mandel), colormap(map), axis off;