How to save multiple outputs of a for loop and combining it into a matrix?

So I am trying to make a matrix using a for loop and right now I have it generating row vectors. But my questions is how do I assign the row vectors and combine them at the end. The way I have the code written is weird so I can't use vertcat.

if true
 % III.  Use For loop to generate the followig matrix "A": 
%        col1: 0 0 ... 0   (25 zeros)
%        col2: 1 1 ... 1   (25 ones)
%        col3: 2 2 ... 2   (25 twos)
%        col4: 3 3 ... 3   (25 threes)
%        col5: 4 4 ... 4   (25 fours)
%        col6: 5 5 ... 5   (25 fives)
%        col7: 6 6 ... 6   (25 sixes)
%        col8: 7 7 ... 7   (25 sevens)
%        col9: 8 8 ... 8   (25 eights)
%        col10: 9 9 ... 9  (25 nines)
      n=0
      for i=1:10 
      a(1:1,1:25)=n 
      n=n+1; 
      end
end

Answer 1

[KL]

It's always better to pre-allocate,

 A = zeros(25,10); %number of rows, number of columns

Then use indexing,

https://de.mathworks.com/help/matlab/learn_matlab/array-indexing.html

 for colNo = 1:size(A,2)
    A(:,colNo) = ... %your value here
 end

As you can see, you index one column during every iteration of the for loop, not 1:10. To index all rows, I've mentioned simply a colon (:). Please read the link I've mentioned above.

Just so you know, easier alternative is,

 A = repmat(0:9,25,1);