Split vector every time data changes from 2 to 1

I have one vector filled with 1 and 2 as follows:

Vector A:

1

1

1

1

2

2

2

1

1

2

2

1

1

1

2

2

1

1

2

2

I want to split the above vector everytime the value change the 1, then I will have:

Vector B Vector C Vector D Vector E

1 1 1 1

1 1 1 1

1 2 1 2

1 2 2 2

2 2

2

2

Thank you

Answer 1

[Walter Roberson]

vectors = mat2cell(A, diff([0;find(A(1:end-1)==2 & A(2:end) == 1); length(A)]),1);

Answer 2

[Jos (10584)]

Another approach:

A = [1 2 1 1 2 1 2 2 1 1 1 2 2 2 1 1 1 2].' % data
C = accumarray(cumsum([0 ; diff(A)==-1])+1, A, [], @(x) {x}) % engine
isequal(A,cat(1,C{:})) % check

Answer 3

[KSSV]

A = [1
1
1
1
2
2
2
1
1
2
2
1
1
1
2
2
1
1
2
2] ;

idx = find(diff(A)==-1) ;
idx = [0 ; idx ;length(A)] ;
N = length(idx)-1 ;
iwant = cell(N,1) ;
for i = 1:N
    iwant{i} = A(idx(i)+1:idx(i+1)) ;
end
celldisp(iwant)