Returning NaN after mean or sum calculation

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Pierluigi Vellucci
Pierluigi Vellucci 2019-2-12
编辑： Matt J 2019-2-12
Dear all,
I have the following problem with a file, that I attached below. The file is a .txt. When I'm importing the data, I obtain a 43705x1 double file that I renamed x. When I write
>> mean(x)
or
>> sum(x)
the result I obtain is:
ans =
NaN
Why? I checked the presence of NaN in the file, e.g. by
>> x==NaN
but I obtained
>> max(ans)
ans =
logical
0
Does anyone know why there is NaN?
Thank you!

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采纳的回答

Star Strider
Star Strider 2019-2-12
I cannot reproduce the problem you are seeing.
My code:
T = readtable('01-RHab.txt','ReadVariableNames',0);
x = T.Var1;
mean_x = mean(x)
sum_x = sum(x)
producing:
mean_x =
868.811686380379
sum_x =
37974890

更多回答（1 个）

Matt J
Matt J 2019-2-12
编辑：Matt J 2019-2-12
To find the location of NaNs, you can do,
find(isnan(x))
Your current method does not work because NaNs are not equal to one another,
>> NaN==NaN
ans =
logical
0

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