Record every 12 values in a loop

Question

Amy07 2021-6-16

回答： Rik 2021-6-16

I have monthly data that I would like to group by year, so every 12 values.

I have created a loop:

for ii = 1:length(monthly)
    years = monthly(1:12:end);
    chl_years{ii} = years;
end

This records the 12th value for each year, when instead I need values 1-12 as one cell array, 13-24 as another, and so on.

I'm not sure what to change in order to do this. Thank you.

Answer 1

Rik 2021-6-16

Using a cell as an intermediate step is generally not efficient, but it tend to be easy to work with.

With that in mind: you can use mat2cell to split an array into groups of 12.

data=1:10;
k=2;
mat2cell(data,1,k*ones(1,numel(data)/k))
ans = 1×5 cell array
    {[1 2]}    {[3 4]}    {[5 6]}    {[7 8]}    {[9 10]}