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Re: Just another Mathematica "Gotcha"

• To: mathgroup at smc.vnet.net
• Subject: [mg120837] Re: Just another Mathematica "Gotcha"
• From: gac <g.crlsn at gmail.com>
• Date: Fri, 12 Aug 2011 05:05:46 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

I think I see. If I compare your output with that for the other form: 

In[1]:= FullForm[Hold[
  Series[a + (b1 + b2) x, {x, 0, 1}] /. {b2 -> 0} // Normal]]

Out[1]/FullForm= Hold[Normal[ReplaceAll[Series[Plus[a,Times[Plus[b1,b2],x]],List[x,0,1]],List[Rule[b2,0]]]]]

Normal acts only after ReplaceAll applies the List to the Series, yes?

Someone suggested only using //-type operations at the end of statement, e.g., // Normal, // MatrixForm, // TraditionalForm, etc.  I think this is a good idea.  I've been doing this without having a good reason (except that "form follows function" ^_^ ).  Now, it seems that I have a stronger reason.

Thanks.

Glenn

• Follow-Ups:
  • Re: Just another Mathematica "Gotcha"
    • From: DrMajorBob <btreat1@austin.rr.com>