Select duplicate values from a list

Question

How can I select the duplicate values in a list?

Example:

{1, 2, 1, 1, 1, 1}

Have you even looked at the link above? It returns {1}. Please make an effort. — Öskå, Jun 09 '14 at 15:17

score 0 · Answer 1 · answered Jun 09 '14 at 15:50

0

If you want all duplicates then:

list = {1, 2, 1, 1, 1, 1}

Select[Split@Sort@list, Length@# > 1 &]

if you want one from each duplicate then

Select[Split@Sort@list, Length@# > 1 &][[;;,1]]

answered Jun 09 '14 at 15:50

Basheer Algohi

1 Answers1