Hello Giulia,
You may try something like this.
If you need more info on conditional statements, you can refer to this page
td=rand(783,1230,62); %Generate variables for the example
sal=rand(783,1230,3,62);
l=1:7:size(td,3); % Indices to separate the days in the week e.g. 1 8 15 ...
tdw=zeros([size(td,[1 2]) size(l,2)]); % Array where the means of td for every week will be stored
salw=zeros([size(sal,[1 2 3]) size(l,2)]); %Same but for sal
for i=1:numel(l) %Loop through the first day of the weeks 1 8 15 ...
if i+1>numel(l) % This will only be true for the last week. Because if we call l(i+1) it will give us an error
% And because the last week is not 7 days, we take the mean of td
% and sal from day l(end), 57, to end of td, 62
tdw(:,:,i)=mean(td(:,:,l(i):end),3);
salw(:,:,:,i) = mean(sal(:,:,:,l(i):end),4);
else % The rest of the iterations will enter here, where we take the mean between of td or sal between the first and last day of week i
tdw(:,:,i)=mean(td(:,:,l(i):l(i+1)-1),3);
salw(:,:,:,i) = mean(sal(:,:,:,l(i):l(i+1)-1),4);
end
end
Hope this helps!
