MATLAB: Divide an array in areas based on its values

arrayfindmatrixmatrix manipulation

Suppose that I want find the edges of ones and of not ones such that I can divide an in areas the array. Suppose the array is as the example below:
a=[1 1 1 1 1 1 12 10 1 1 1 1 1 11 12 1 1 1 2 3]
a(1:6) -->area1 of ones
a(7:8) -->area1 of not ones
a(9:a13) -->area2 of ones
a(14:15)-->area2 of not ones
a(16:19)-->area3 of ones
a(20) -->area3 of not ones
and so on..

Best Answer

a=[1 1 1 1 1 1 12 10 1 1 1 1 1 11 12 1 1 1 2 3 ]
idx=find(a==1)
e=[diff(idx) 100]
f=find(e~=1)
ff=idx(f)
ii1=[idx(1) idx(f(1:end-1)+1)]
ii2=idx(f)
idx=find(a~=1)
e=[diff(idx) 100]
f=find(e~=1)
ff=idx(f)
jj1=[idx(1) idx(f(1:end-1)+1)]
jj2=idx(f)
for k=1:numel(ii1)
  area1(k)={ii1(k):ii2(k)};
  area0(k)={jj1(k):jj2(k)};
end
Related Question