설문 종료
설문
Which does NOT return sorted output for a vector of unique values (e.g., v = [3,7,2,5,1])?
sort(v)
8%
unique(v)
16%
union(v, [ ])
17%
intersect(v, v)
14%
setdiff(v, [ ])
12%
All return sorted output
33%
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can you give solution oft these problrm
You can try all options yourself and/or read the documentation for each to find the correct answer.
I don't know about the other functions, but unique used to return the original order (which is probably why the 'stable' switch exists).
I also find it interesting to see the orientation that each of these functions return.
Once you know that unique returns sorted output, you can deduce that the last answer should be correct: it would not make sense for only one of the set functions to not return sorted output.
Does it? Because I would also expect the orientation of the resulting vectors to be the same for all set functions, and yet they are not. Can you predict without testing (or reading the documentation) which is the odd one out?
I find it weird that the legacy syntaxes of these (setdiff, intersect and union) mathematical functions are not the same.
Quite inconsistent.
Good point, that (orientation of the resulting vectors) is an inconsistency I can't explain. Then again, I only said "should be correct", not "is correct". ;)
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