How to calculate the mean value and standard deviation of 3 specific columns?

I have an excel file with a table 1442x31. I have extracted the 3 columns I want to calculate on a different table, named cols. Cols table size is 1439x3

And I want to calculate the mean and standard deviation of each of these columns.

I tried these:

mean_val = mean(cols);
stan_dev = std(cols); 

But the result on both of mean and std was [NaN NaN NaN].

[Sriram Tadavarty]

Implies the values have some NaN entries.

Try once

mean_val = mean(cols,'omitnan');
stan_dev = std(cols,'omitnan'); 

Hope this helps