要讀取矩陣的行數(shù)和列數(shù),可以使用numpy庫中的shape屬性。下面是一個示例代碼:
import numpy as np
# 創(chuàng)建一個3x4的矩陣
matrix = np.array([[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12]])
# 獲取矩陣的行數(shù)和列數(shù)
num_rows, num_cols = matrix.shape
# 打印行數(shù)和列數(shù)
print("矩陣的行數(shù)為:", num_rows)
print("矩陣的列數(shù)為:", num_cols)
運行上面的代碼,將輸出以下結(jié)果:
矩陣的行數(shù)為: 3
矩陣的列數(shù)為: 4