How to add certain rows to a 2D matrix?

I have a simple 2D matrix like this:

A = [34 10;
     23 10;
     64 10];

What I need to do is to find the "max(A(:,1))" then "while A(j,1) < max(A(:,1))" add rows like [A(j,1)+1 10] to the matrix; so I want to eventually get this:

A = [34 10;
     35 10;
     36 10;
     37 10;
       .
       .
       .
     62 10;
     63 10;
     64 10;
       .
     23 10;
     24 10;
     25 10;
       .
       .
       .
     62 10
     63 10
     64 10
       .
     64 10];

I have written the following but it does not work:

for j = 1:size(A,1)
    while A(j,1) < max(A(:,1))
        A(end+1,:) = [A(j,1)+1 10];
    end
end

Any ideas how I could do that?

Answer 1

[Birdman]

A=[34 10;23 10;64 10];
val=max(A(:,1));
for i=1:size(A,1)
B{i,1}=[(A(i,1):val).' (A(i,2)*ones(val-A(i,1)+1,1))];
end
B=cell2mat(B)

Answer 2

[Stephen23]

>> A = [34,10;23,10;64,10];
>> X = max(A(:,1));
>> M = cell2mat(arrayfun(@(n)(n:X).',A(:,1),'uni',0));
>> M(:,2) = 10
M =
   34   10
   35   10
   36   10
   37   10
   38   10
   39   10
   40   10
   41   10
   42   10
   43   10
   44   10
   45   10
   46   10
   47   10
   48   10
   49   10
   50   10
  ...
   60   10
   61   10
   62   10
   63   10
   64   10
   64   10