Re: Simplify needs ages to finish
- To: mathgroup at smc.vnet.net
- Subject: [mg44777] Re: Simplify needs ages to finish
- From: Thomas Gutzler <gutzler at itiv.uni-karlsruhe.de>
- Date: Thu, 27 Nov 2003 11:38:04 -0500 (EST)
- Organization: University of Karlsruhe, Germany
- Sender: owner-wri-mathgroup at wolfram.com
Roland Franzius wrote:
> Thomas Gutzler wrote:
>
> 1) At least three syntax errors are in this text. Look for & & instead &&
All copy'n'paste typos..
> 2) Rewrite your SetDelayed in the following form
> o1[a1_, a2_, a3_, a4_, b1_, b2_, b3_, b4_] :=
> Evaluate[LogicalExpand[righthandside]]
>
> This will save you some time but only if:
>
> 3) you state the definitions in reverse order. Otherwise you are getting
> lost alredy at definition time.
That's true but what you get is kindof strange.
I found "!!!" at least once. After that I thought: Well, if it doesn't
simplify "!!!" to "!" it probably doesn't simplify anything. So I added
a Simplify[..] around Evaluate[..] => took ages again :/
> 4) write a test set
>
> test=
> Rule@@@Transpose[{{a1,a1,...b4},Table[If[Random[]<0.5,True,False],{8}]}]
>
> and test your definitions using values Replace[#,test]&/@op[a1..]
>
> 5) You need at least 256 MB memory. Otherwise disk swapping becomes time
> consuming
>
> 6)dont print the full result. (I have not seen it;-) Probably it will
> take 100 times the memory used to represent the result internally.
This set of functions is only for testing purpose. I wanted to finish
with 64 input variables and 32 output functions but I suppose I'm not
getting a result ever :(
Thanks,
Tom