python创建矩阵

There is no specific data type in Python to create a matrix, we can use list of list to create a matrix.

Python中没有特定的数据类型来创建矩阵，我们可以使用list列表来创建矩阵 。

Consider the below example,

考虑下面的示例，

mat = [
[10, 20, 30],
[40, 50, 60],
[70, 80, 80]
]

It can be considered a 3x3 matrix, there are 3 rows and 3 columns in 'mat' matrix.

可以认为是3x3矩阵，“ mat”矩阵中有3行3列。

访问矩阵元素 (Accessing matrix elements)

Just like matrix in C/C++, we can access the elements in Python also.

就像C / C ++中的矩阵一样，我们也可以访问Python中的元素。

Consider the below program,

考虑下面的程序，

# Python matrix creation
mat = [
[10, 20, 30],
[40, 50, 60],
[70, 80, 80]
]
# printing the matrix
print("mat: ", mat)
# printing rows
print("mat[0]: ", mat[0])
print("mat[1]: ", mat[1])
print("mat[2]: ", mat[2])
# printing specific elements
print("mat[0][0]: ", mat[0][0])
print("mat[0][1]: ", mat[0][1])
print("mat[0][2]: ", mat[0][2])
print("mat[1][0]: ", mat[1][0])
print("mat[1][1]: ", mat[1][1])
print("mat[1][2]: ", mat[1][2])
print("mat[2][0]: ", mat[2][0])
print("mat[2][1]: ", mat[2][1])
print("mat[2][2]: ", mat[2][2])
# printing matrix using loop (matrix form)
print("Matrix is: ")
for i in range(3):
for j in range(3):
print(mat[i][j], end = " ")
print() # prints new line

Output

输出量

mat:  [[10, 20, 30], [40, 50, 60], [70, 80, 80]]
mat[0]:  [10, 20, 30]
mat[1]:  [40, 50, 60]
mat[2]:  [70, 80, 80]
mat[0][0]:  10
mat[0][1]:  20
mat[0][2]:  30
mat[1][0]:  40
mat[1][1]:  50
mat[1][2]:  60
mat[2][0]:  70
mat[2][1]:  80
mat[2][2]:  80
Matrix is: 
10 20 30 
40 50 60 
70 80 80 

翻译自: https://www.includehelp.com/python/program-to-create-matrix.aspx

python创建矩阵