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Re: DownValues

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113715] Re: DownValues
  • From: Stephan <stschiff80 at googlemail.com>
  • Date: Mon, 8 Nov 2010 05:40:28 -0500 (EST)

Wow, I would have never found this...

Thanks a lot.

Stephan

Am 08.11.2010 um 09:08 schrieb Leonid Shifrin:

> Hi Stephan,
>
> You want to look at SubValues.
>
> ?SubValues
>
> SubValues[f] gives a list of transformation rules corresponding to all subvalues (values for f[x,\[Ellipsis]][\[Ellipsis]], etc.) defined for the symbol f.
>
> These are not much documented in the system, but you can search for SubValues in the newsgroup archive and
> find much more. I also briefly mention them in my book, at
>
> http://www.mathprogramming-intro.org/book/node92.html
>
> Hope this helps.
>
> Regards,
> Leonid
>
> On Mon, Nov 8, 2010 at 11:39 AM, Stephan <stschiff80 at googlemail.com> wrote:
> Hi,
>
> Is there any way to find out about definitions like:
>
>        f[1][2] == 3 ?
>
> Here is a sample run:
>
> In[1]:== f[1][2] == 3
> Out[1]== 3
> In[2]:== DownValues[f]
> Out[2]== {}
> In[3]:== DownValues[f[1]]
>        During evaluation of In[3]:== DownValues::"sym" :  "
>        StyleBox[\"\\\"\< is expected to be a symbol.\>\\\"\", \"MT\"]  \
> Out[3]== DownValues[f[1]]
>
> So with "DownValues" I can't seem to learn about the definition f[1][2]..=


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