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Re: Colored Output

• To: mathgroup at smc.vnet.net
• Subject: [mg87252] Re: Colored Output
• From: Szabolcs Horvát <szhorvat at gmail.com>
• Date: Sat, 5 Apr 2008 04:24:54 -0500 (EST)
• Organization: University of Bergen
• References: <ft4n1k$3pt$1@smc.vnet.net>

foice.news at gmail.com wrote:
> I would like to have evaluated expression with some costants painted
> in a particular color, just to make reading easier.
> Say my input is
> 
> D[a*Sin[x]]
> 
> and the output should be
> 
> a*Cos[x]
> 
> with colored "a", say magenta.
> 
> Is this achievable, and how? which kind of attributed of the constant
> a should I set?

I don't know much about expression formatting.  While this appears to 
work in a few simple tests, I do not know how robust it is:

MakeBoxes[a, StandardForm] = StyleBox["a", FontColor -> Red]

After this line has been evaluated, the symbol 'a' will be printed in 
red (when output is set to StandardForm).  The formatting rule can be 
removed with

MakeBoxes[a, StandardForm] =.

Szabolcs