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MathGroup Archive 2004

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Union & Select for removing duplicates in a list

  • To: mathgroup at
  • Subject: [mg47933] Union & Select for removing duplicates in a list
  • From: "Blimbaum, Jerry AA R22" <jerry.blimbaum at>
  • Date: Fri, 30 Apr 2004 19:27:29 -0400 (EDT)
  • Sender: owner-wri-mathgroup at
  • Thread-topic: Union & Select for removing duplicates in a list

I got list of numbers using FindRoot...which had duplicates...or, at
least, what looked like duplicates....I used Union to sort and ,
according to documentation, remove duplicates....but it didnt list , after Union, looks like this for example....

{.0035, .0035, .005, .006...etc..}

I was actually building up {x,y} pairs from several  lists one entry of
which came up as {.0035, .0035} for example.....I then applied Select

Select[{x,y} pairs, #[[1]]NotEqual#[[2]]&]......and to my surprise this
worked, it removed {.0035, .0035}.....I assume that 'duplicate' for
Union and Select mean the same thing.....but then not according to the
actual operations.....

what am I missing?

thanks....jerry blimbaum

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