MATLAB: Mean of the third dimension

3dMATLAB and Simulink Student Suitematrix arraymean

Hi I an new to matlab and learning thru practice and patience. I have a data set with for precipitation containing data for 37 years. X=141, Y=41 and T=37. I want to get the mean per year (37) I tried the following code but on my dataset I ended uo with 71 observations. Why this is happening? If I only want the mean per year? Thanks in advance.
avg3=nanmean(rain(:,:,3));

Best Answer

Not entirely sure what you are asking.
Do you want to compute the mean for each year for each combination of X and Y? That would result in a 141x41 array.
MeanRain = mean(rain,3);
Do you want to compute the mean over all X and Y, resulting in one element per year, so a vector of length 37? Here, I'd just reshape the rain matrix to be a 141*41 by 37 array, so 2-dimensional. Then take the mean down the columns of that array, so on the first dimension. The result of the computation below would be a 1x37 vector.
MeanRain = mean(reshape(rain,[],37),1);
Either could be what you are asking.
Related Question