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I have a list with numerical and non numerical elements:

l1={{1,1},{2,2},{a,a},{,b},{c,};

what is an efficient rule to select the elements where both components are numerical? so I should be able to obtain l2={{1,1},{2,2}}. thanks

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  • $\begingroup$ 35101 $\endgroup$ – Kuba Jan 20 '17 at 11:13
  • $\begingroup$ indeed, as written in that post: 'Select[l1,AllTrue@NumericQ]' does the trick. $\endgroup$ – Luigi Jan 20 '17 at 12:28