Seperating vectors when reaching a threshold value

What I am trying to do is seperate a vector into other vectors when the second column of the sums to a certain values and then repeat again once it reaches a another value; so it produces seperate vectors.

For example

A(1)=[1; 3; 4; 6; 1; 2; 4; 3; 5; 2; 1; 4; 2; 4]
A(2)=[3; 5; 7; 4; 9; 1; 5; 6; 8; 9; 6; 2; 4; 1]

So when A(2) summation reaches 20, it will produce a new vector B

B(1)=[1; 3; 4; 6]
B(2)=[3; 5; 7; 4]

So when A(2) summation reaches 50 it will produce a new vector C
C(1)=[1; 2; 4; 3; 5]
C(2)=[9; 1; 5; 6; 8]

and so on.

Any help would be much appreciated

[Azzi Abdelmalek]

What is A(2) summation? and What A(1) is doing in your question? and what after 20, then 50?

Answer 1

[David Sanchez]

You do not have many clues of what is going on in your code, but this could be of some help and give you some ideas about what to do next:

A_1=[1; 3; 4; 6; 1; 2; 4; 3; 5; 2; 1; 4; 2; 4];
A_2=[3; 5; 7; 4; 9; 1; 5; 6; 8; 9; 6; 2; 4; 1];
sum = 0;
my_limit = 20;
for k=1:length(A_2)
    sum = sum + A_2(k);
    if sum > my_limit
        B_1 = A_1(1:k-1);
        B_2 = A_2(1:k-1);
        break; % get out of for-loop
    end
end
my_limit = 50;
for k2 = k:length(A_2)
    sum = sum + A_2(k2);
    if sum > my_limit
        C_1 = A_1(k:k2-1);
        C_2 = A_2(k:k2-1);
        break; % get out of for-loop
    end
end

Answer 2

[Azzi Abdelmalek]

A{1}=[1; 3; 4; 6; 1; 2; 4; 3; 5; 2; 1; 4; 2; 4];
A{2}=[3; 5; 7; 4; 9; 1; 5; 6; 8; 9; 6; 2; 4; 1];
a=cumsum(A{2});
m=max(a);
a(end)=a(end)+1;
id=unique([20 50:50:m m]);
idx2=arrayfun(@(x) find(a>x,1),id);
idx2=[idx2(1:end-1)-1 idx2(end)];
idx1=[1 idx2(1:end-1)+1];
for k=1:numel(idx1);
  out{k,1}=A{1}(idx1(k):idx2(k))';
  out{k,2}=A{2}(idx1(k):idx2(k))';
end

% Check the result

%first arrays
B1=out{1,1}
C1=out{1,2}
%second arrays
B2=out{2,1}
C2=out{2,2}
%third array
B3=out{3,1}
C3=out{3,2}