How to append for each iteration?

Dear all,

the situation is the following: I have a projectlength of 3 years with an assumed number of hours of 10. For each hour the yield is calculated with a certain function (which I simplify in this example with the number 2). As the projectlength and hournumber should stay variable, I would like to first calculate the yield in each hour of the year (helper(k)) and then append the solutions of each projectyear below each other. So the yield should look like this:

I got the following so far, however, it does not work.

hournum = 10;
projectlength = 3;
yield = [];

for p=1:projectlength
    for k = 1:hournum
        helper(k)=2;
    end
    yield(p) = [yield(p); {helper(k)}];
end  

Error Message: Index exceeds the number of array elements (0).

[Jan]

Whenever you write "does not work", append the error message or a details description of the difference between your expectations and the obtained results.

[Maria Hart]

Ok, thank you. I have added the error message.

Answer 1

[Jan]

hournum = 10;
projectlength = 3;
yield = cell(1, projectlength);  % Pre-allocate as cell
helper = zeros(1, hournum);      % Pre-allocate as vector
for p = 1:projectlength
    for k = 1:hournum
        helper(k) = 2;
    end
    yield{p} = helper;
end  

[Maria Hart]

I have tried your solution, but I get a 1x3 cell with thee times the 2 instead a 30x1 vector.

[Maria Hart]

Thank you for your answer. If you would like to have instead a simple vector with all numbers beneath each other and no cell (I would like to plot all data), what would I do?

[Maria Hart]

Found a way with cell2mat!