programming, using op(), was ..RE: Bugfix for GosperSum? (was: cannot load Zeilberger)

Attached is an implementation (in lisp) of a case statement.

I disagree with your design that looks like case(a,b,c,d,e,f,g). Too easy to
lose the parity.

I prefer case(a,[b,c],[d,e]...).  Note that [] is used to enclose lists, and
is used in some options for Taylor series, declarations, ...

It turns out that the implementation is agnostic with respect to syntax,
And so case(a, b:c, d:e, f:g) works and so does  infix("->");
case(a, b->c, d->e, f->g).

Further documentation is in the file.  Someone looking into the evaluation
of mprog in maxima might make the program a little spiffier.

RJF



> -----Original Message-----
> From: maxima-bounces at math.utexas.edu [mailto:maxima-
> bounces at math.utexas.edu] On Behalf Of Michel Van den Bergh
> Sent: Sunday, January 07, 2007 11:22 AM
> To: maxima at math.utexas.edu
> Subject: programming, using op(), was ..RE: Bugfix for GosperSum?
> (was: cannot load Zeilberger)
> 
> >
> > You could simulate it by  case(expr,test,block([]....), test, .... I
> > suppose. Just wordier.
> The block statements are not necessary unless you want local variables
> and then you need "block"
> anyway.
> 
> I think
> 
> case (
>           expr1,   (
>                    statement1,
>                    statement2
>       ),   expr2,   (
>                   statement1,
>                   statement2
>        )
> )
> 
> looks rather good. I don't like the square brackets. They are not used
> as delimiters elsewhere.
> 
> Michel
> 
> 
> 
> 
> 
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