Why Indeterminate?
- To: mathgroup at smc.vnet.net
- Subject: [mg118516] Why Indeterminate?
- From: Themis Matsoukas <tmatsoukas at me.com>
- Date: Sat, 30 Apr 2011 05:53:56 -0400 (EDT)
Consider this expression:
A[a_List, x_] := x (1 - x) \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(j = 1\), \(2\)]
\*FractionBox[\(a[[j]]
\*SuperscriptBox[\((1 - 2\ x)\), \(j - 1\)]\), \(1 -
a[[3]] \((1 - 2 x)\)\)]\)
a = Range[3];
Evaluation at x=0.5 gives
A[a, 0.5]
Indeterminate
..but I can get the right answer if I use
A[a, x] /. x -> 0.5
0.25
What puzzles me is that there is no obvious indeterminacy in the original expression at x=0.5.
Thanks
Themis