Allocate certain numbers to create a new matrix from A and B

Hi everyone, just having this thought. I have two matrices A and B.

A = [1 1 1 0;
     1 1 0 0;
     0 1 0 1;];
 
B = [1 2;
     1 3;
     2 4;
     1 5;];

I want to create C by allocating each row of B, depending whether A rows has zero or one. For example, row 1 of A with 1 1 1 0, first coloum is 1 so allocate 1 2; colum 2 is 1 3; column 3 is 2 4; column 4 is empty. Image below how it should look like in C.

Answer 1

[madhan ravi]

c=repmat(1:size(A,2),size(A,1),1);
v=(A==1) .* c;
vv=cell2mat(arrayfun(@(x) B(x,:),nonzeros(v.'),'un',0));
Rows_of_A=mat2cell(vv,sum(A,2));
celldisp(Rows_of_A)

[JL]

Hi Madhan, thank you very much. Just another question, with regards to Rows_of_A, possible to create a for loop? Like for each Rows_of_As will generate a certain numbers so for instance, there's 3 Rows_of_A{1} to Rows_of_A{3}. Idont know whether is correct

for iter =1:3 %i dont know how to indicate the 3 Rows_of_A
    %number x is generated
    Z{iter}=x
end

Zcompile = cat(1,Z{:}); % to store each x 

[JL]

How do I call indicate the first loop is Rows_of_A{1} and then Row_of_A{3} until I get my Zcompile

Zcompile = [x; % x from 1st loop
            x; % x from 2nd loop
            x; % x from 3rd loop
            ];

[madhan ravi]

I’m not sure what you’re asking , are you asking how to implement the solution I have into a loop or something different? What’s x?

[JL]

yes, how to implement the solution you have into a loop. x is just calculated number if let say it goes through a loop

[madhan ravi]

[m,n]=size(A);
s=repmat(1:n,m,1);
v=(A==1) .* s;
x=nonzeros(v.');
c=cell(numel(x),1);
for k = 1:numel(x)
    c{k} = B(x(k),:);
end
vv=cell2mat(c);
Rows_of_A=mat2cell(vv,sum(A,2));
celldisp(Rows_of_A)

[JL]

Hi Madhan, I realised you have an x in your code. Actually, let say I'm using yy instead of x. This yy is supposed to be calculated inside the loop.

[JL]

And I want to use a for loop, where the loop goes through the 3 different Rows_of_A derived and for each, theres yy value that is calculated. Do I make sense? Sorry for not being clear

[madhan ravi]

Why are you hanging on to the loop? I'm not sure I understand. Perhaps illustrate with an example and the desired output or ask a new question providing all the necessary details.

[JL]

Thanks Madhan, here is an illustriation

[madhan ravi]

You would be better off, if you ask a new question , I am not able to cope up with what you want or which one you're after , after all you already get the result which you showed in the original question.