Returning NaN after mean or sum calculation

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!

Answer 1

[Star Strider]

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

Answer 2

[Matt J]

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