Zeppe
10/13/2008 10:05:00 AM
PeterAPIIT@gmail.com wrote:
> On Oct 12, 4:26 pm, "Bo Persson" <b...@gmb.dk> wrote:
>> puzzlecracker wrote:
>>> NOT SURE WHEN TO USE WHICH
>> Using partial_sort will actually sort the first part of the sequence,
>> nth_element will not. It just separates the elements in "before" and
>> "after", but in no particular order.
>>
>
>
> Can you explain with example ?
>
sequence = [5 6 3 2 4 5 6 7];
|
nth
if I do partial_sort with n = 4, the elements 0,..,4 (before and
including position n) will be sorted, the 5,..,7 will not be
necessarily, that is, a possible outcome is:
[2 3 4 5 5 6 7 6]
|
nth
if I do nth_element, not even the elements strictly before position n
will be sorted, but they will be all less or equal to the nth. A
possible outcome is:
[2 4 5 3 5 6 7 6]
|
nth
If you have full-sort, every element is in its "sorted" position. If you
have partial sort, the first n elements will be in their sorted
position. If you have nth_element, only the nth element is in its sorted
position.
Best wishes,
Zeppe