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MathGroup Archive 2007

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Re: Real/Comlex function problem with D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74233] Re: Real/Comlex function problem with D
  • From: bar at ANTYSPAM.ap.krakow.pl
  • Date: Thu, 15 Mar 2007 04:58:33 -0500 (EST)
  • Organization: Akademia Pedagogiczna w Krakowie
  • References: <et8e29$pqb$1@smc.vnet.net>

bar at ANTYSPAM.ap.krakow.pl wrote:
> When i try 
> ff1[x_]:=D[ff[x],x];
>  I found ff1 is Complex funtion again !!

I found, that I don't understand how Math works ..:-(

ETA[x_,t_]:=(1+I)(x^2 Sin[t]);
d1[x_,t_]:=Evaluate[D[ComplexExpand[ETA[x,t],{x,1}]];d1[1,1]
d2[x_,t_]:=ComplexExpand[Evaluate[D[ETA[x,t],{x,1}]];d2[1,1]

out:
(2+2I) Sin[1]
(1+I) Sin[1] 


?????



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