A general question about intersect
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Hello -
I have a general question. I can provide specifics if needed.
How is it possible for
size(intersect(MyData(i),MyData))
to be not equal to
size(i)
Put another way, how can the intersect of a subset of a vector and the original vector not be the entire subset of the vector? I seem to have a case where it is and I can't understand how that can be. It seems impossible, by defintion.
Thanks.
采纳的回答
Walter Roberson
2019-11-10
0 个投票
- Duplicates in the data. An element that occurs more than once among the MyData(i) will only result in one output
- Duplicates in the i values have the same effect.
- NaN == NaN is never true, so the results of intersect() remove all NaN
更多回答（1 个）
Image Analyst
2019-11-10
0 个投票
Because one element, MyData(i), does not necessarily match every single element of MyData. For example 2 will match only 1 element of this three element vector [1, 2, 3]. It matches only element #2 and does not match element #1 or element #3 so the length will be only 1, NOT 3.
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