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From: Richard Fateman on 12 Jan 2010 04:51

Is there a neat way to create a new symbol,
say /!. so that

expression /. BetterRules[rules]

could be written as

expression /!. rules

I do not find writing something like

(expression) ~BR~ (rules)

to be quite adequate, especially with the extra parentheses.
RJF


From: Jaebum Jung on 13 Jan 2010 05:56
You might want to try Notation package.

In[1]:= <<Notation`
In[2]:= BetterRules[x_->y_]:=x->y^2
In[3]:= Notation[x__/! y_ \[DoubleLongLeftRightArrow]
ReplaceAll[x__,BetterRules[y_]]]
In[4]:= (x+y)/!(x->3)
Out[4]= 9+y

Jaebum

On 1/12/10 3:49 AM, Richard Fateman wrote:
> Is there a neat way to create a new symbol,
> say /!. so that
>
> expression /. BetterRules[rules]
>
> could be written as
>
> expression /!. rules
>
> I do not find writing something like
>
> (expression) ~BR~ (rules)
>
> to be quite adequate, especially with the extra parentheses.
> RJF
>
>
>


From: Chris Osborn on 14 Jan 2010 05:48
On Jan 12, 3:51 am, Richard Fateman <fate...(a)cs.berkeley.edu> wrote:
> Is there a neat way to create a new symbol,
> say /!. so that
>
> expression /. BetterRules[rules]
>
> could be written as
>
> expression /!. rules
>
> I do not find writing something like
>
> (expression) ~BR~ (rules)
>
> to be quite adequate, especially with the extra parentheses.
> RJF

Hi Richard,

Yes, use the "Notation Package" (you can search for this in the docs).
The actual function you will want to use is probably "InfixNotation".

It's a bit weird though since you have to paste a skeleton of your
call to InfixNotation
from a palette, and then fill in the box asking for your operator.

I haven't done this in a while, but it's all described in the docs.

Chris

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