[ism,idx] = ismember(A,B(:,1)); returns
- ism, a logical array the same size as A saying whether each element of A is in B(:,1), i.e., ism is true where the corresponding element of A exists in B(:,1) and ism is false where the corresponding element of A is not in B(:,1)
- idx, the index in B(:,1) where the first instance of each element of A exists, or 0 if that element of A does not exist in B(:,1)
Examples to illustrate:
x = [10;50;70];
y = [10;30;50;70];
[ism,idx] = ismember(x,y)
x = [10;50;70];
y = [10;30;10;30;50;70];
[ism,idx] = ismember(x,y)
x = [10;20;70];
y = [10;30;10;30;50;70];
[ism,idx] = ismember(x,y)
assert is used in this case to make sure that all elements of A exist in B(:,1). If that's not the case, an error is thrown, execution of the code stops, and subsequent commands are not executed.
assert(all(ism))
References:
