RE: [Axiom-developer] print or output in packages.

[Bill Page]

On February 16, 2006 6:42 AM Francois Maltey wrote:
> 
> I use to add a lot of spy-print in mysterious functions. 
> So I add print or output lines as bellow in a test, but I 
> can't compile.
> 
> In an *.input file I have no problem with output.
> 
> I try the easiest print, with or without coerce ::, with or without $.
> 
>       output ("a string"::OutputForm)$OutputPackage
>       output (1::OutputForm)$OutputPackage

You can use this:

output(outputForm("abc")$OutputForm)$OutputPackage
output(outputForm(1)$OutputForm)$OutputPackage

> -- or     print ("num::OutputForm"::OutputForm)$PrintPackage
> --      print ("num::OutputForm")$PrintPackage
> --      output "den::OutPutForm" 
> 
> 
> In the manip.spad file there are num and den that I try to print 
> (in kerexpand about line 790)
> 
>       num := numer arg
>       den := denom arg
> 
> They are perhaps of type : SparseMultivariatePolynomial(R, Kernel $)
> 
> 1/ How can I print theses variables ?
> 2/ What function must I use : print or output ?
>    What is the difference between.
> 

First import OutputForm and OutputPackage near the start of the
file, like this:

  Implementation ==> add

-- for debugging only
    import OutputForm
    import OutputPackage
-- end debugging
    import FactoredFunctions(P)

Now later in the program you can write:

-- for debugging output
      num := numer arg
      den := denom arg
      output(message "num:")
      output(num::OutputForm)
      output(message "den:")
      output(den::OutputForm)
-- end debugging

See for example:

http://wiki.axiom-developer.org/SandBoxManip

Regards,
Bill Page