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]
?????