Re: Formating output of Modules
- To: mathgroup at smc.vnet.net
- Subject: [mg2259] Re: [mg2214] Formating output of Modules
- From: Allan Hayes <hay at haystack.demon.co.uk>
- Date: Thu, 19 Oct 1995 01:32:36 -0400
Scott Herod <sherod at boussinesq.colorado.edu>
in [mg2214] Formating output of Modules
asks about formatting output.
Here is his example:
> Format[spam[x_]] := 1/x;
> spam[a_] := Module[{},pop = Table[a,{3}]];
> spam[8]
>
> {8, 8, 8}
>
> I would like spam[8] to return {8,8,8} but to print the output as
> 1/8.
"
Scott,
The output is {8,8,8} which is not of the form spam[x_]; so no
formatting is done. Also,to get 1/8 needs a different formatting
rule.
It seems unlikely that you want to change the format for lists, so
you might consider wrapping the output and then putting in a
formatting instruction for the wrapped form.
* Example *
Format[vv[{x_,___}]] := 1/x;
spam[a_] := Module[{},pop = vv[Table[a,{3}]]];
spam[8]
1
-
8
FullForm[%]
vv[List[8, 8, 8]]
Allan Hayes
hay at haystack.demon.co.uk
***********************************
Begin forwarded message:
>From: Scott Herod <sherod at boussinesq.colorado.edu>
>To: mathgroup at smc.vnet.net
>Subject: [mg2214] Formating output of Modules
>Organization: University of Colorado at Boulder
I've got an annoying little problem that I was hoping someone can
help me solve. I have a Module, NDelaySolve, which returns a
numerical approximation of solutions to differential-delay equations.
In order to make the output look as much like that of NDSolve as
possible, I have the module return something like
{{x[t] -> g[t], y[t] -> f[t]}}
where g[t] and f[t] are often big Which[] functions. I would like
to reduce the output by creating a DelaySolveFunction[][t] which
looks something like an Interpolating function.
Here is an example:
In[4]:=
Format[spam[x_]] := 1/x;
In[8]:=
spam[a_] := Module[{},
pop = Table[a,{3}]
];
In[9]:=
spam[8]
Out[9]=
{8, 8, 8}
This Format isn't doing what I want. I would like spam[8] to
return {8,8,8}
but to print the output as 1/8. If I get this one to work, I could solve
my real problem.
Scott Herod
sherod at newton.colorado.edu