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Re: Hold and Equal
*To*: mathgroup at smc.vnet.net
*Subject*: [mg73734] Re: Hold and Equal
*From*: dh <dh at metrohm.ch>
*Date*: Tue, 27 Feb 2007 05:41:50 -0500 (EST)
*References*: <erufqm$s7j$1@smc.vnet.net>
Hi Murray,
a quick and dirty solution that does not create evaluation problems is
to convert your expression into a string and make the replacement there:
fun[x_]:= StringReplace[ToString[x], "==" -> "="]
if you now say: fun[(a + b)^2 == Expand[(a + b)^2]] you get:
2 2 2
(a + b) = a + 2 a b + b
Daniel
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.
>
>
>
>
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