Re: Forcing Re[]'s to be Real

*To*: mathgroup at smc.vnet.net*Subject*: [mg18261] Re: [mg18223] Forcing Re[]'s to be Real*From*: Anthony Foglia <afoglia at physics.ucsb.edu>*Date*: Thu, 24 Jun 1999 14:24:45 -0400*Sender*: owner-wri-mathgroup at wolfram.com

On Wed, 23 Jun 1999, Daniel Lichtblau wrote: > I could not replicate your findings in any current version of > Mathematica (that is, version 3 or 4), Sorry, it appears to be that I'm using Mathematica 3.0 for Linux. (In the About box, there's a X 3.0.2.0 under the read line and the graphic of the box.) > although I got something along > the lines of what you say using version 2.2. The way to get the sort of > result you want (this is true in general, independent of version) is to > reverse the order of ComplexExpand and Re. In version 2.2: > > > In[2]:= ComplexExpand[Re[Sqrt[1+I]]] > > 1/4 Pi > Out[2]= 2 Cos[--] > 8 Okay, I discovered I put a space after the I when I wrote it with a radical sign, but that still doesn't help me do a graph of the function. I've tried ComplexExpand[Re[k[w]]], and Re[ComplexExpand[k[w]]].