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type Fractal{T <: FloatingPoint}
z::Array{Complex{T}, 2}
c::Array{Complex{T}, 2}
step::Function
function Fractal(imgsize, make_c = z -> z, step = (z, c) -> z.^2 + c)
line = linspace(-2.0, 2.0, imgsize)
plane = [ complex(x, y) for x=line, y=line ]
new(plane, make_c(plane), step)
end
end
function step{T <: FloatingPoint}(f::Fractal{T})
f.z = f.step(f.z, f.c)
end
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