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Re: [Axiom-math] Axiom: Printing multiple variables in axiom.


From: Martin Rubey
Subject: Re: [Axiom-math] Axiom: Printing multiple variables in axiom.
Date: 10 Nov 2007 12:11:32 +0100
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.4

Constantine Frangos <address@hidden> writes:

> Hi Martin,
> 
> Thanks for the reply. I tried your suggestion and this works perfectly - the 
> inverted commas are ok.
> 
> I tried your suggestion from a previous email to get axiom expressions in the 
> form: 2*x1 instead of 2x1.

why do you want to coerce the result of unparse (which is a string) to OUTFORM?
Note that unparse takes something of type InputForm,  so you'll have to coerce
y to INFORM before passing it to unparse.  The error message is telling you
exactly this.

Martin

> (9) -> y
> (9) -> 
>    (9)  cos(x2) + 2x1
>                                                      Type: Expression Integer
> (10) -> unparse(y)::OUTFORM
>    There are no exposed library operations named unparse but there is 
>       one unexposed operation with that name. Use HyperDoc Browse or 
>       issue
>                              )display op unparse
>       to learn more about the available operation.
>  
>    Cannot find a definition or applicable library operation named 
>       unparse with argument type(s) 
>                              Expression Integer
>       
>       Perhaps you should use "@" to indicate the required return type, 
>       or "$" to specify which version of the function you need.
> (10) -> 
> 
> 
> 
> 
> On Friday 09 November 2007 20:41, Martin Rubey wrote:
> > Constantine Frangos <address@hidden> writes:
> > > In the function below, I tried to use the following commands
> > >
> > > )display value Acon
> > > print(['Acon = Acon])
> > >
> > > to print one or more variable.
> > >
> > > However, I get very strange behaviour and error messages, so had to
> > > comment them out. There might be a bug somwhere in my program.
> > >
> > > If an axiom expert could implement a simplified version of the Maxima
> > > display() function (probably a lisp function) in lisp/axiom, then this
> > > would be very useful.
> > >
> > > In Maxima:
> > >
> > >  x1:1;
> > >  x2:2;
> > >  x3:3;
> > >  display(x1,x2,x3); ->
> > >  x1 = 1
> > >  x2 = 2
> > >  x3 = 3
> >
> > Well, axiom functions always evaluate all it's arguments first.  So, for
> > debugging I usually use
> >
> > output ["x1: ", x1, " x2: ", x2]
> >
> > If you want cleaner output, you'll have to look into OutputForm. For
> > example, to print a string without the quotes, you can use message$OUTFORM:
> >
> > (1) -> message("1")$OUTFORM
> >
> >    (1)  1
> >                                                              Type:
> > OutputForm
> >
> > At least for expressions there is a way to quote and unquote, but I don't
> > have it present right now.
> >
> > Martin
> 
> -- 
> Constantine Frangos, Pr.Eng.
> Professor
> Dept. of Mathematics and Statistics
> University of Johannesburg
> Auckland Park Kingsway Campus
> P O Box 524
> Auckland Park 
> Johannesburg 2006
> South Africa
> 
> Tel: +27-11-559-2452
> Fax: +27-11-559-2832
> e-mail: address@hidden , address@hidden 





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