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I have a nested list:

{{{1, 2, 3, 4, 5, 6}}, {{1}, {2, 3, 4, 5, 6}}, {{1, 2}, {3}, {4, 5, 6}}}

and would like to select only those lists out of it with two items in it:

{{{1}, {2, 3, 4, 5, 6}}}

How could this be achieved?

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    $\begingroup$ Select[lst, Length@# == 2 &] (see Select) $\endgroup$ – kglr Jun 19 '17 at 21:49
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    $\begingroup$ Cases[lst,{_,_}] $\endgroup$ – andre314 Jun 19 '17 at 21:58
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Input

data = {{{1, 2, 3, 4, 5, 6}}, {{1}, {2, 3, 4, 5, 6}}, {{1, 2}, {3}, {4, 5, 6}}};

Select[data, Length @ # == 2 &]

Output

{{{1}, {2, 3, 4, 5, 6}}}
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  • $\begingroup$ thanks! very helpful $\endgroup$ – Wafram Jul 14 '17 at 18:46
  • $\begingroup$ You are welcome :) $\endgroup$ – e.doroskevic Jul 15 '17 at 22:33

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