RE: Re: Hold and Equal
- To: mathgroup at smc.vnet.net
- Subject: [mg73760] RE: [mg73739] Re: [mg73715] Hold and Equal
- From: "Virgilio, Vincent - SSD" <Vincent.Virgilio at itt.com>
- Date: Wed, 28 Feb 2007 04:23:09 -0500 (EST)
Mr. Woll, step[] has an interesting syntactic style. Did you intentionally group "&" with the following argument, rather than with the preceding Function body? That reminds me of the alternative practices between C and C++, which either groups "*" with the declarator (C) or the type specifier (C++). Vince Virgilio -----Original Message----- From: Carl Woll [mailto:carlw at wolfram.com] Sent: Tuesday, February 27, 2007 5:45 AM To: mathgroup at smc.vnet.net Subject: [mg73760] [mg73739] Re: [mg73715] Hold and Equal Murray Eisenberg wrote: >How can I produce in an Output cell (under program control) an >expression like the following, > > (a+b)^2 = a^2+ 2 a b + b^2 > >where instead of the usual Equal (==) I get a Set (=), as in >traditional math notation? I want to input the unexpanded (a+b)^2 and >have the expansion done automatically. > >Of course, I can try something like the following: > > (a+b)^2 == Expand[(a+b)^2]) > >So how do I convert the == to =? Of course > > ((a + b)^2 == Expand[(a + b)^2]) /. Equal -> Set > >gives a Set::write error. And > > (Hold[(a + b)^2 == Expand[(a + b)^2]]) /. Equal -> Set > >doesn't actually evaluate the Expand part and leaves the "Hold" wrapper. > > Murray, How about using HoldForm? step[x_] := HoldForm[x = #] &[Expand[x]] step[(a+b)^2] (a+b)^2=a^2+2 b a+b^2 Carl Woll Wolfram Research ************************************ This e-mail and any files transmitted with it are proprietary and intende= d solely for the use of the individual or entity to whom they are addressed. If yo= u have received this e-mail in error please notify the sender. Please note that = any views or opinions presented in this e-mail are solely those of the author and d= o not necessarily represent those of ITT, Inc. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mai= l. ************************************ =0D