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Problem with "Which"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122204] Problem with "Which"
  • From: mbmb <sb at 9y.com>
  • Date: Thu, 20 Oct 2011 07:44:54 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Who can check my module?

KD[f0_, a0_, b0_] := Module[{f = f0, a = a0, b = b0},
f2 = D[f, {x, 2}];
ew = Solve[D[f, x] == 0, x, Reals];
Print["Extremwerte: ", {Which[f2 > 0, "T", f2 < 0, "H", f2 = 0, "S" ], x, f} /. ew];
Print["Extremwerte: ", {If[f2 > 0, "T", "H" ], x, f} /. ew];
]

When I enter: KD[x^3 - 3 x^2, -1, 4] the output is

Extremwerte: {{Which[-6+6 x<0,H,f2=0,S],0,0},{T,2,-4}}

whereas the IF-line gives

Extremwerte: {{H,0,0},{T,2,-4}}

Why can't I use Which in this case. Why doesn't Mathematica evaluate f2 in all cases?



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