How could I check that how many elements of x is inside y?

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VIJENDRA
VIJENDRA 2015-9-23
编辑： Stephen23 2015-9-23
Suppose I have
x = [2,7,8,11];
and
y = [1,2,4,5,7,8,9,12,15,21,27]
How could I check that how many elements of x is inside y?

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Stephen23
Stephen23 2015-9-23
编辑：Stephen23 2015-9-23
You can use ismember:
>> x = [2,7,8,11];
>> y = [1,2,4,5,7,8,9,12,15,21,27];
>> ismember(x,y)
ans =
1 1 1 0
>> sum(ismember(x,y))
ans = 3

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