pandas 不明白：ValueError: Can only tuple-index with a MultiIndex
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时间：2020-09-14 04:15:50 来源:igfitidea点击:
Don't understand: ValueError: Can only tuple-index with a MultiIndex
提问by Demetrios Papakostas
I know this question already exists, but the answers havent helped me.
我知道这个问题已经存在，但答案并没有帮助我。
def function(T,theta,A):
x=(T-theta)/A
return(x)
filen=pd.read_csv('filename')
filelist=[file,file2,...,filen)
labels=['name1','name2',...]
colors=['red','blue','green',...]
for i in range(len(filelist)):
x=filelist[i]['column1']
y=filelist[i]['column2']
y2=(1/y)
plt.plot(x, y2, colors[i], label=labels[i])
plt.legend()
plt.plot()
w=np.where(x>170)
print(x[w]) #error, can only tuple index with multiindex
other_fit=curve_fit(function,x,y)
popt, pcov=other_fit
plt.plot(x, function(x, *popt), colors2[i], label=labels2[i])
plt.show()
The error occurs at x[w].
When I am not in the for loop, there is no error.
错误发生在x[w]。
当我不在 for 循环中时，没有错误。
The error message is as follows:
ValueError: Can only tuple-index with a MultiIndex
错误信息如下：
ValueError: Can only tuple-index with a MultiIndex
回答by MaxU
Try to change:
尝试改变：
w=np.where(x>170)
to:
到：
w = x[x>170]
np.wherereturns a tuple in your case:
np.where在您的情况下返回一个元组：
Returns
If only `condition` is given, return the tuple ``condition.nonzero()``, the indices where `condition` is True.
退货
If only `condition` is given, return the tuple ``condition.nonzero()``, the indices where `condition` is True.
