[英]Python 'spread' simulation
所以,我有一个列表形式
[['0','0','0','0','0'],
['0','0','0','0','0'],
['1','0','0','0','0'],
['1','0','0','0','0'],
['0','0','0','0','0']]
我希望围绕“ 1”的“ 0”在一步之后变为“ 1”,就像这样。
[['0','0','0','0','0'],
['1','0','0','0','0'],
['1','1','0','0','0'],
['1','1','0','0','0'],
['1','0','0','0','0']]
经过足够的步骤后,所有的“ 0”变为“ 1”。
我的代码如下
def simulate_bushfire(list, steps):
for _ in range(steps):# iterates through the number of steps
for y in range(len(initial_bushfire[0])):
for x in range(len(initial_bushfire)): #for all y coordinates possible in the file
if initial_bushfire[y][x] =='1':# looks for cells that has '1' in it
for a in range(x-1,x+2): #looks at the neighbour of the cell that has'1' in it (x coordinates)
for b in range(y-1,y+2):#looks at the neighbour of the cell that has'1' in it (y coordinates)
if a<0 or b<0 or b>=len(initial_bushfire[0]) or a>=len(initial_bushfire):# if neighbour is outside the border of the map,
#code will ignore to avoid errors like list out of range
continue
if initial_bushfire[b][a]=='':# if there's an empty string (no tree)
continue # ignore this as well (no trees to burn )
if initial_bushfire[b][a]=='0': #if there is a '0' in the file (there is a tree)
initial_bushfire[b][a]='1'# change the '0' to a '1' (tree on fire)
return (initial_bushfire)
但似乎“传播”太多了,只有一步之遥。 我似乎不明白为什么,但是我想这是由于这条线
for a in range(x-1,x+2): #looks at the neighbour of the cell that has'1' in it (x coordinates)
for b in range(y-1,y+2):#looks at the neighbour of the cell that has'1' in it (y coordinates)
如果有人可以为我提供有关此代码的指导,我将不胜感激。
问题在于,您正在将新传播的火力以相同矩阵的形式作为原始火力的一部分,因此当您继续寻找火力时,它们会进一步扩散到其他灌木丛中。 您应该使用一个单独的列表来跟踪新的火灾,并且仅在完成对整个林区火灾矩阵的扫描后才将它们应用于最后:
def simulate_bushfire(initial_bushfire, steps):
for _ in range(steps):# iterates through the number of steps
new_fire = []
for y in range(len(initial_bushfire[0])):
for x in range(len(initial_bushfire)): #for all y coordinates possible in the file
if initial_bushfire[y][x] =='1':# looks for cells that has '1' in it
for a, b in (x - 1, y), (x + 1, y), (x, y - 1), (x, y + 1): #looks at the neighbouring cells
if a<0 or b<0 or b>=len(initial_bushfire[0]) or a>=len(initial_bushfire):# if neighbour is outside the border of the map,
#code will ignore to avoid errors like list out of range
continue
if initial_bushfire[b][a]=='':# if there's an empty string (no tree)
continue # ignore this as well (no trees to burn )
if initial_bushfire[b][a]=='0': #if there is a '0' in the file (there is a tree)
new_fire.append((b, a))# change the '0' to a '1' (tree on fire)
for y, x in new_fire:
initial_bushfire[y][x] = '1'
return (initial_bushfire)
以便:
simulate_bushfire(l, 1)
会返回:
[['0', '0', '0', '0', '0'],
['1', '0', '0', '0', '0'],
['1', '1', '0', '0', '0'],
['1', '1', '0', '0', '0'],
['1', '0', '0', '0', '0']]
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