How to assign values to a variable size array

The following works fine

k=[];

for jj=1:10
k(jj,:)=randi(10,1,3);
end

However, I'm facing difficulties when I try to assign different rows' elements to variable size array k:

k=[];

for jj=1:10
k(1,:)=randi(10,1,jj);
end

I would appreciate your help.

[Walter Roberson]

Arrays cannot have different number of elements per row or column.

[Asaf McRock]

Thank you Mr. Roberson.

Is it possible to get a row vector k as an output? that is, stack all random row vectors side by side in k

[KALYAN ACHARJYA]

Are you considering this

k=[];
for jj=1:10
k=[k,randi(10,1,jj)];
end

Or

For rows or column vectors of different lengths, you can save the data in a cell array.

[Asaf McRock]

This works perfectly. But I wonder how can I use a cell array inside a for loop for saving rows or column vectors of different lengths.

Thank you, Mr. Acharjya!

[Walter Roberson]

N = 10;
k = cell(N,1);

for jj = 1:N
  k{jj} = randi(10,1,jj);
end

k

k = 10x1 cell array
    {[        6]}
    {1×2  double}
    {1×3  double}
    {1×4  double}
    {1×5  double}
    {1×6  double}
    {1×7  double}
    {1×8  double}
    {1×9  double}
    {1×10 double}

[Asaf McRock]

Thank you, gentlemen!

I'm learning so much from you. Much appreciated!