CODEWITHSUNDEEP
matlab
zebra
zebra

Reputation: 6531

How to check if one vector is a subset of another?

I'm looking for a matlab way of doing this. Looping through seems easy enough. I have two vectors, say a = [1 2 3] and b = [1 54 2 4 6 3]. I want to determine if a is a subset of b. How is this done?

Upvotes: 9

Views: 12510

Answers (2)

NightFox
NightFox

Reputation: 125

You could also do intersect of both sets and see if it is empty or not. C = intersect(A,B) returns the data common to both A and B with no repetitions.

Upvotes: 0

gnovice
gnovice

Reputation: 125854

Probably the easiest and quickest way to do this is to use the functions ISMEMBER and ALL:

isSubset = all(ismember(a, b));

You can also use SETDIFF and ISEMPTY, but this appears to be less efficient (it runs a little slower than the above in R2010b):

isSubset = isempty(setdiff(a, b));

Upvotes: 10

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