Re: RealValued functions and derivatives
- To: mathgroup at smc.vnet.net
- Subject: [mg63406] Re: RealValued functions and derivatives
- From: "Valeri Astanoff" <astanoff at yahoo.fr>
- Date: Fri, 30 Dec 2005 02:32:25 -0500 (EST)
- References: <dojesh$fo8$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Fabrice, Zis is my way (maybe not the best way) to force derivative real values : In[1]:=$Version Out[1]=5.1 for Microsoft Windows (January 28, 2005) In[2]:=<<Algebra`ReIm` In[3]:=x/:Im[x]=0; y/:Im[y]=0; Algebra`ReIm`Private`RealValuedQ[f]^=True; Algebra`ReIm`Private`RealValuedQ[Derivative[_,_][f]]^=True; In[7]:=Im[Derivative[1,0][f][x,y]] Out[7]=0 In[8]:=Im[Derivative[0,1][f][x,y]] Out[8]=0 Et voila ! v.a.