adding elements in a loop into an array

I need to ask the user for the number of windows in a house give the sizes of all the windows. To do this, I am trying to use loops to determine how many times to ask for a window's size and add the size into an array. My problem is that when the code is ran, x = [], and doesn't contain the elements I inputed.

Here's me code:

num_windows = input('How many windows?: ');
x = [];
for k = 1:num_windows
  window_size = input('Window size?: ');
  x = x + window_size; 
end

Answer 1

[Fangjun Jiang]

Use x=[x;window_size];

or a better way,

if num_windwows>0
   x=zeros(num_windwows,1);
else
   error('Invalid number of windows');
end

Then inside the for-loop

x(k)=window_size;