将列名与r中的非零列值连接起来

import numpy as np

def connect_columns_with_nonzero_values(matrix):
    column_names = matrix.columns
    nonzero_columns = matrix.columns[matrix.sum(axis=0) != 0]
    connected_string = ', '.join([f"{column}:{matrix[column].values}" for column in nonzero_columns])
    return connected_string

# 示例数据
matrix = np.array([[1, 0, 2],
                   [0, 3, 0],
                   [4, 0, 5]])

# 示例调用
result = connect_columns_with_nonzero_values(matrix)
print(result)