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Oops. What I got in the email works but what you posted here doesn't work. list1third=Union[Map[#[[3]]&,list1]]; list2third=Union[Map[#[[3]]&,list2]]; I guess you did an edit after the email notification was sent. But those two...
Hi Rohit, Thanks. Just for convenience of later programming. There are 720 indices. I suppose I could shift everything by 1 and make it 721. I will give it a shot.
Hi Hans, Many thanks. The first example with Select works perfectly. I didn't know to put the ampersand at the end. Why is that necessary?