manipulate a method contain to compare two lists

l have trouble with the code below. l want to compare two lists of elements to : 1)know wether the neighbours of j are included in k 2)know wether the set of j is equal to k

but matlab returns me an error

    if (contains(neighbour_n{k}, neighbour_n{j})||(neighbour_n{j}==neighbour_n{k}));

Undefined function or method 'contains' for input arguments of type 'double'.

Answer 1

[Guillaume]

contains is not a standard matlab function. You can test set membership wih ismember. it'll return a vector of [true, false] values, so if you just want a scalar, yo need to use all.

Similarly, == returns a vector of [true, false] and only works if both matrices / vectors being compared are the same size. To test that two (sorted) sets are identical you'd use |isequal

Thus,

if all(ismember(neighbour_n{j}, set_n{k})) && isequal(set_n{j}, set_n{k})
    %do something

Answer 2

[Jan]

The error message tells you, that there is no function called "contains". Why do you assume that there is such a function?

Are you sure that you need the elementwise comparison "==" or would isequal be better?

Answer 3

[mazari ahmed]

it's working look here :

if (((all(ismember(neighbour_n{k}, neighbour_n{j})))||(isequal(neighbour_n{j}, neighbour_n{k})))&&(k~=j));

end