Yearly average but keeping matrix dimensions

Question

redlush 2020-3-9

回答： the cyclist 2020-3-10

Hello

I am trying to compute the yearly average of a 365x121x240 array.

What I used to do before is:

average=nanmean(mat,1);

squeezenan=squeeze(mat,1);

This will give me the average but in a matrix with dimensions 121x240.

But in this case, I want to take the average of the 365 days, while keeping the new matrix dimensions as 365x121x240.

the cyclist 2020-3-9

For the moment, let's ignore the 3rd dimension.

Suppose matrix is this:

mat = [1 2;
       4 5]; 

The mean along the 1st dimension is

average = [2.5 3.5];

How would you have wanted the 1st dimension treated, if you had wanted it to stay length 2? Did you want

average = [2.5 3.5
           2.5 3.5];

?

redlush 2020-3-10

Yes, I would essentially just repeat the average.

Answer 1

the cyclist 2020-3-10

repavgmat = repmat(mean(mat,1),[size(mat,1) 1 1]);