When I used an internet search engine to search for "MATLAB nanmean" the official documentation was the very first result! And the first line states: " y = nanmean(X) is the mean of X, computed after removing NaN values."
You should learn how to search the MATLAB documentation: it really is rather helpful, and makes your life much easier when you can find things by yourself without having to ask stranger on the internet. Spend ten minutes navigating the contents (on the left on the website) and you might just discover lots of useful new functions and advice too!
