Test if vector elements are a subset of another vector.
% subset of numerical vectors
a = [2,3,4,5,6]
b = [3,5]
% is 'b' a subset of 'a' ?
all(ismember(b, a))
1 % True (yes is subset)
% subset of logical vectors
% use find when comparing logical index vectors
x=[1,2,3,4,5,6,7,8]
idxA= x > 3
0 0 0 1 1 1 1 1
idxB= x > 5
0 0 0 0 0 1 1 1
% is logical vector idxB a subset of idxA ?
all(ismember(find(idxB), find(idxA)))
1 % True (yes is subset)