On 05/11/2016 17:10, Mr. Wrobel wrote:
1. What I have found is modified python interpreter - pypy -
http://pypy.org that does not require any different approach to develop
your code.
2. And: Gpu based computing powered by Nvidia (NumbaPro compiler):
https://developer.nvidia.com/how-to-cuda-python
Nice Mandelbrot benchmark link in that article. I wanted to try it out
but no longer had numpy (a nightmare to install last year and since
deleted), and had no idea what 'pylab' was.
I used the code below in pure Python (but Py3 because of the print
functions). ('mandel_nc()' also dispenses with complex numbers - if you
want to port elsewhere without complex support, or just understand what
is being calculated.)
(Most of the runtime here seems to be spent in the print functions in
writepgm().)
-----------------------------------------
#Mandelbrot test derived from:
# http://nbviewer.jupyter.org/gist/harrism/f5707335f40af9463c43
def mandel(x, y, max_iters):
c = complex(x, y)
z = 0.0j
for i in range(max_iters):
z = z*z + c
if (z.real*z.real + z.imag*z.imag) >= 4:
return i
return max_iters
#def mandel_nc(x, y, max_iters):
# a = b = 0
# for i in range(max_iters):
# a, b = a*a-b*b+x, 2*a*b+y
# if (a*a + b*b) >= 4:
# return i
# return max_iters
def create_fractal(min_x, max_x, min_y, max_y, image, iters):
height = len(image)
width = len(image[0])
pixel_size_x = (max_x - min_x) / width
pixel_size_y = (max_y - min_y) / height
for x in range(width):
real = min_x + x * pixel_size_x
for y in range(height):
imag = min_y + y * pixel_size_y
color = mandel(real, imag, iters)
# color = mandel_nc(real, imag, iters)
image[y][x] = color
def createimage(height,width):
image = [[0 for i in range(width)] for i in range(height)]
return image
def writepgm(file,image,maxpixel=255):
height = len(image)
width=len(image[0])
f = open(file, "w")
print ("P2", file=f)
print (width,height, file=f)
print (maxpixel, file=f)
for y in range(height):
for x in range(width):
print (image[y][x],"",end="",file=f)
print (file=f)
f.close()
maxpixel=20
im=createimage(1024,1536)
create_fractal(-2.0, 1.0, -1.0, 1.0, im, maxpixel)
writepgm("test.ppm",im,maxpixel)
-----------------------------------------
--
Bartc
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