# [Tutor] Still having trouble with my game of life algorithm

Matt Smith matt at mattanddawn.orangehome.co.uk
Fri May 25 22:31:45 CEST 2007

```Hi,

First of all, thanks to everyone who helped with my last post
(http://mail.python.org/pipermail/tutor/2007-May/054360.html). I have
re-written the function that applies the rules but it still doesn't
return the expected result. I have been through it and corrected a
couple of bugs bet as far as I can tell it should return a matrix that
has had the rules of Conway's game of life
(http://en.wikipedia.org/wiki/Conway%27s_game_of_life) applied. Here is
my function:

def update_matrix(matrix):
matrix_updated = matrix
# Perform check for each value in the matrix
for x in range(len(matrix[0])):
for y in range(len(matrix)):
neighbour_count = 0
for n in (x-1, x, x+1):
for m in (y-1, y, y+1):
try:
if matrix[m][n]:
if (n,m) != (x,y):
neighbour_count = neighbour_count + 1
except IndexError:
pass
# Apply game of life rules to each item in the matrix
if neighbour_count < 2:
matrix_updated[y][x] = 0
elif neighbour_count > 3:
matrix_updated[y][x] = 0
elif neighbour_count == 3:
matrix_updated[y][x] = 1
# No need to change value if neighbour count == 2
return matrix_updated

I have also attached the full program and the input file that I am using
for testing in case anyone is interested. The program does use curses to
display the board so I guess it won't be any good for Windows users.

I hope someone can see where I am going wrong here.

Thanks,

Matt
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```

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