Question

我有一个名为Matrix的二维数组。数组中填充了一堆o和c。我试图逐个遍历数组元素。如果一个元素符合一组特定的规则，我想将该元素更改为N。

下面是我这样做的代码。当我运行代码时，某些元素将替换为N，但并非所有应替换的元素。

真的很感谢您的帮助，谢谢！

2D阵列：

https://nofile.io/f/74GXSntofsG/obstaclemapinput.txt

输出的2D数组：

https://nofile.io/f/ZhzK38x4Sqp/obstaclemap.txt

代码：

matrix_icrement_width = int(width/int(boxsize))
matrix_icrement_height = int(height/int(boxsize))
Matrix =  [[0 for x in range(matrix_icrement_width)] for y in range(matrix_icrement_height)] 

#The 2d array is populated however that code is long and irrelevant so I did not include it in my question 

def traverse_matrix():
for i in range (0,matrix_icrement_width):
    for j in range (0,matrix_icrement_height):
        if Matrix[i][j]== "o":
            #if u r on a wall, dont do anything
            break

        if Matrix[i][j-1] == "o":
            #if u were on a wall, but not anymore
            Matrix[i][j] = "N"

        if Matrix[i+1][j] == "c":
            #if the space below u is a path
            Matrix[i][j] = "N"

        if Matrix[i][j+1] == "o":
            #if the space infront of u is a wall
            Matrix[i][j] = "N"



def printMatrix():
    f = open('obstaclemap.txt', 'w')
    f.write('\n'.join([''.join(['{:4}'.format(item) for item in row]) 
      for row in Matrix]))
    f.close()

traverse_matrix()
printMatrix()

Answer 1

我认为该问题是由于粗心地使用break而不是continue造成的。尝试替换它，让我知道结果。

matrix_icrement_width = int(width/int(boxsize))
matrix_icrement_height = int(height/int(boxsize))
Matrix =  [[0 for x in range(matrix_icrement_width)] for y in range(matrix_icrement_height)] 

#The 2d array is populated however that code is long and irrelevant so I did not include it in my question 

def traverse_matrix():
for i in range (0,matrix_icrement_width):
    for j in range (0,matrix_icrement_height):
        if Matrix[i][j]== "o":
            #if u r on a wall, dont do anything
            continue         #Modify this

        if Matrix[i][j-1] == "o":
            #if u were on a wall, but not anymore
            Matrix[i][j] = "N"

        if Matrix[i+1][j] == "c":
            #if the space below u is a path
            Matrix[i][j] = "N"

        if Matrix[i][j+1] == "o":
            #if the space infront of u is a wall
            Matrix[i][j] = "N"



def printMatrix():
    f = open('obstaclemap.txt', 'w')
    f.write('\n'.join([''.join(['{:4}'.format(item) for item in row]) 
      for row in Matrix]))
    f.close()

traverse_matrix()
printMatrix()

Python-遍历和修改二维数组不起作用

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