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MathGroup Archive 1996

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help

  • Subject: [mg3146] help
  • From: OGLAIZOT at ac.dal.ca ("NAME \"Olivier Glaizot\"")
  • Date: 7 Feb 1996 05:01:22 -0600
  • Approved: usenet@wri.com
  • Distribution: local
  • Newsgroups: wri.mathgroup
  • Organization: Wolfram Research, Inc.
  • Sender: daemon at wri.com

I have a problem and maybe some of you can help me with it: I use a recursive
function, let say f[x_]:=f[x]=g[f[x-1],y];
with f[0]=0 as a terminal function.
Now within the function g, there is a maximum to be found, something like
Max[f[x-1],{y,0,ysup}] y being a discrete parameter (y=0,1,...ysup)
It is very time consuming, but I know that the discrete function to be
maximized has always a maximum, usually for small values of y. 
Then, my idea was instead of building the whole Table {g[f[x-1],[y1],...
g[f[x-1],ysup], to stop as soon as g decrease again, with a function of the
type While[g[yi]>g[yi-1],i++,temp=g[yi]], so the computation stops as soon as
the function g decreases.
Now the problem is that as it is a recursive function, the While[] is called in
a nested way, and the initial values of i reset each time, at least I think it
is what happens, and the results are of course wrong. Does anyone has a good
idea? Or is it not clear (I'm afraid so...)
thanks,
Olivier
____________________________________________________________________________
| OLIVIER GLAIZOT	  	****NEW ADDRESS FROM THE FIRST MAY 1996**** |
| Biology Department             Institute of Zoology and Animal Ecology    |
| Dalhousie University           Biology Building, University of Lausanne   |
| Halifax, N.S.                  CH-1015 DORIGNY                            |
| B3H 4J1 CANADA        	 SWITZERLAND                                |
| e-mail: oglaizot at ac.dal.ca     	olivier.glaizot at izea.unil.ch        |
|_________________________________________________________________________  |
| Home address:								    |
| 1523 Chesnut Street                             			    |
| Halifax B3H 3S9                                                           |
| CANADA                                                                    |
| Tel/Fax: (1-902) 423-9397				    		    |
|___________________________________________________________________________|


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