Comparing two arrays of different length

Hi,

I have two arrays like, A=[11 11 2 3; 5 2 6 9] and B=[11 3; 2 9]. I want to know the indices of array A where the column of B is equal to column of A. In this case, the indices are [2 4].

How can I do that?

Thanks in Advance.

Answer 1

[Giorgos Papakonstantinou]

You could this to find it:

idx = ismember(A', B', 'rows');
c = 1:size(A, 2);
d = c(idx); % is your answer

[Majbah]

Thanks!

[Josep Llobet]

indeed, maybe

ismember(0, unique(idx)) 

used with 0 (no-coincident) or 1 (coincident), may be useful.

Then combined with

length(unique(idx))

For to know about the totallity of coincidences

Answer 2

[Azzi Abdelmalek]

A=[11 11 2 3; 5 2 6 9]
B=[11 3; 2 9]
idx=find(ismember(A',B','rows'))

[Majbah]

Thanks!