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MathGroup Archive 2004

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  • To: mathgroup at
  • Subject: [mg50423] Cases
  • From: "Blimbaum, Jerry AA R22" <jerry.blimbaum at>
  • Date: Fri, 3 Sep 2004 03:35:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Given:   x = {a,b,c,d,d};

Applying   Cases[x,d]   gives an output of {a,b,c}......

However, Cases[x,Not[d]] gives as output an empty list  { }... I
expected   {a,b,c}.....

Why didnt I get that?

This issue came up when using Thread on vectors...and in some cases the
Thread resulted in 0 == 0  so it's output in the list  was 
True....and I
wanted to remove them....

thanks.....jerry blimbaum

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