MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Real/Comlex function problem with D


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] 


?????



  • Prev by Date: Re: Multi-core Support in Mathematica 5.2
  • Next by Date: Re: Real/Comlex function problem with D
  • Previous by thread: Re: HTML Problem with piecewise defined functions
  • Next by thread: Re: Real/Comlex function problem with D