A Julia program to generate Julia set images. Images are written on to stdout in PGM format. Args: image size (pixels. width and height are equal to this.) value of complex parameter real part value of complex parameter imaginary part Accompanying post at: http://sidekick.windforwings.com/2013/02/julia-sets-using-julia.html

julia.jl

# A Julia program to generate Julia set images.
# Images are written on to stdout in PGM format.
# Args:
#       image size (pixels. width and height are equal to this. default 200)
#       value of complex parameter real part (default 0)
#       value of complex parameter imaginary part (default 0.65)
# Accompanying post at: http://sidekick.windforwings.com/2013/02/julia-sets-using-julia.html

w,h = 200
c = 0 + 0.65im

if(length(ARGS) >= 3)
        w,h = int(ARGS[1])
        c = float(ARGS[2]) + float(ARGS[3])*im
end

print("P2\n#Julia with Julia\n$(w) $(h)\n255\n")
for r_val in linspace(-2.0, 2.0, w), im_val in linspace(-2.0, 2.0, h)
        z = r_val + im_val*im
        n = 255
        while abs(z) < 10 && n >= 5
                z = z*z + c
                n -= 5
        end
        print("$n ")
        if im_val == 2.0
                print("\n")
        end
end