Question

我需要检查gradscale中的数字是否以Numpy数组的形式存在于我的NxM矩阵中，如果数字8例如位于我的矩阵中，我想将该数字附加到一个空列表中，并将行号附加到另一个列表中因此，我该如何检查矩阵中的数字是否不在Gradescale中，我尝试了不同类型的循环，但它们不起作用。

 wrongNumber = []
 Rows = []
 gradeScale = np.array([-3,0,2,4,7,10,12])
 if there is a number i matrix which is not i gradeScale
     wrongNumber.append[number]
     Rows.append[rownumber]
print("the grade {} in line {} is out of range",format(wrongNumber), 
format(Rows))

Answer 1

您可以使用numpy.ndarray.shape浏览各行。

for row in range(matrix.shape[0]):
    for x in matrix[row]:
        if x not in gradeScale:
            wrongNumber.append(x)
            Rows.append(row)

此外，您没有正确使用format。您的打印声明应为

print("The grade {} in line {} is out of range".format(wrongNumber, Rows))

以下帖子提供了有关格式化String formatting in Python的更多信息。

示例

import numpy as np

wrongNumber = []
Rows = []

matrix = np.array([[1,2],[3,4],[5,6],[7,8]])
gradeScale = [1,3,4,5,8]

for row in range(matrix.shape[0]):
    for x in matrix[row]:
        if x not in gradeScale:
            wrongNumber.append(x)
            Rows.append(row)

print("The grades {} in lines {} (respectively) are out of range.".format(wrongNumber, Rows))

输出

The grades [2, 6, 7] in lines [0, 2, 3] (respectively) are out of range

Answer 2

您正在寻找带有enumerate()的for循环。

示例：

for rowNumber, number in enumerate(matrix)
    if number not in gradeScale:
        wrongNumber.append[number]
        Rows.append[rowNumber]

如何检查矩阵中的数字

2 个答案:

示例

输出