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Re: Lisp Macros in Mathematica (Re: If Scheme is so good why MIT

  • To: mathgroup at smc.vnet.net
  • Subject: [mg102489] Re: Lisp Macros in Mathematica (Re: If Scheme is so good why MIT
  • From: David Bailey <dave at removedbailey.co.uk>
  • Date: Tue, 11 Aug 2009 04:03:56 -0400 (EDT)
  • References: <b0g665llur83sj9dnumktjvnipacj7bgrt@4ax.com> <17pco71asfk7d.1kd4oiidz6nqy.dlg@40tude.net> <h5nht7$8nm$1@smc.vnet.net>

fft1976 wrote:
> On Jul 21, 5:31 am, Xah Lee <xah... at gmail.com> wrote:
> 
>> Also, lisp's macros, a feature that gets lispers much ado about
>> nothing. In Mathematica (b ~1989), the whole language can be
>> considered as a extended lisp macros system. When i learned about
>> lisp's macros while practical coding elisp, i find lisp macros are
>> rather so trivial, painful to use, and laughable.
> 
> Is this true? How do you write some simple Lisp-like macros in
> Mathematica? Are Mathematica's macros like Scheme's hygienic macros or
> like Lisp's "low-level" macros?
> 

Although macros can be abused - as they are in many C programs, where 
almost everything is a macro - I'd like to see macros supported directly 
in Mathematica, because they would offer an efficient way to access 
parts of a structure by name - rather than using Part. This gives you 
clarity and speed.

I do have a scheme for doing this. It involves defining functions using 
a modified version of the := operator, which replaces macro expressions 
on the RHS of the function before saving the result in the normal way. 
Macros are defined with a Define\[Breve]Macro call prior to the 
functions that use them. I considered using $Pre or $PreRead, but these 
do not work when programs are read in with Get or in packages.

David Bailey
http://www.dbaileyconsultancy.co.uk


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