import random import pandas as pd import numpy as np import matplotlib.pyplot as plt from sklearn.cluster import KMeans from sklearn.metrics import silhouette_score from sklearn.decomposition import PCA plt.rcParams['font.sans-serif'] = ['SimHei'] dataset=pd.read_excel('C:\\Users\\86180\\Desktop\\第一次数学建模\\湘菜口感好物质.xlsx') dataset = dataset.drop(dataset.index[:1], inplace=False) dataset = dataset.drop(dataset.columns[:1], axis=1, inplace=False) #matrix=dataset.values matrix=np.array(dataset) matrix=matrix.T matrix_xiang=matrix[:27] # 将NaN值替换为0 matrix_xiang = np.nan_to_num(matrix_xiang) # 检测矩阵中是否还有NaN值 这个代码报错TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''应如何修改
时间: 2024-04-16 10:26:56 浏览: 176
根据您提供的代码,错误出在尝试检测矩阵中是否还有NaN值时。出现错误的原因可能是矩阵中的元素类型不符合`np.isnan()`函数的要求。
为了解决这个问题,您可以尝试使用`np.isnan()`函数之前,先将矩阵的元素类型转换为浮点类型(float),然后再进行检测。下面是修改后的代码:
```python
import random
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from sklearn.cluster import KMeans
from sklearn.metrics import silhouette_score
from sklearn.decomposition import PCA
plt.rcParams['font.sans-serif'] = ['SimHei']
dataset = pd.read_excel('C:\\Users\\86180\\Desktop\\第一次数学建模\\湘菜口感好物质.xlsx')
dataset = dataset.drop(dataset.index[:1], inplace=False)
dataset = dataset.drop(dataset.columns[:1], axis=1, inplace=False)
matrix = np.array(dataset)
matrix = matrix.T
matrix_xiang = matrix[:27]
# 将NaN值替换为0
matrix_xiang = np.nan_to_num(matrix_xiang.astype(float))
# 检测矩阵中是否还有NaN值
has_nan = np.isnan(matrix_xiang).any()
if has_nan:
print("矩阵中存在NaN值")
else:
print("矩阵中没有NaN值")
```
在上述代码中,我使用`astype(float)`将矩阵的元素类型转换为浮点类型。然后,再对`matrix_xiang`进行NaN值的替换和检测。这样应该能够解决您遇到的问题。
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