Saving data from loop

while(run<time)

    if(run > time)

       break
    end
~do calculations~

z=[];

pie= crust*apple;

z=[pie];

~do calculations~

end

I'm trying to store all of the calculations from pie but for some reason it is being overwritten each time it goes through the loop. what else would I need to add to have the data saved correctly?

Answer 1

[Stephen23]

method one: concatentation:

z = [];
while ...
   ...
   pie = ...
   z = [z,pie];
end

method two: indexing:

replace z = [z,pie] with:

z(end+1) = pie;

Note that expanding z on each iteration will be very inefficient, and will likely slow down your code: it is rarely a good idea to start with an empty array and enlarge it on each loop iteration. See:

https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

https://blogs.mathworks.com/loren/2012/11/29/understanding-array-preallocation/

[hi hey]

It works! Thank you very much.