How can I merge many rows of different lengths into a matrix?

Hi everyone! I encountered a problem in merging many rows of different lengths into a matrix, for example,

A=[1:2];
B=[3:7];
C=[1:10];

What I want to achieve is to have the following matrix:

D=[A;B;C]
% which does not work
% to be in the format of following

D=[1,2,0,0,0,0,0,0,0,0;
   3,4,5,6,7,0,0,0,0,0;
   1,2,3,4,5,6,7,8,9,10]

Does any one have a good way of filling zeros? The speed is also a concern as such operations would be repeated for millions of times .

Any help would be appreciated!

Answer 1

[Stephen23]

>> C = {1:2,3:7,1:10};
>> L = cellfun('length',C);
>> M = zeros(numel(C),max(L));
>> for k = 1:numel(C), M(k,1:L(k)) = C{k}; end
>> M
M =
    1    2    0    0    0    0    0    0    0    0
    3    4    5    6    7    0    0    0    0    0
    1    2    3    4    5    6    7    8    9   10
    

Answer 2

[Omer Yasin Birey]

Hi Rupeng, as far as I understand you want to work with arrays. So you can use this code below

A=[1:2];
B=[3:7];
C=[1:10];

dimAdjustforA = max(max(length(A),length(B)),length(C))-length(A);%you have to set the dimension
A = [A zeros(dimAdjustforA,1)'];
dimAdjustforB = length(A)-length(B)%again to make it same dimension with the maximum one

B = [B zeros(dimAdjustforB,1)'];
 
D = [A;B;C]