Complement to Problem with the polynomial approximation]

[Daniel Tourde]

Hello,

I got the opportunity to check two different polynomial optimizer :

Here are the results of Matlab for an order 9 approximation :

vect3 =

  Columns 1 through 4 

   0.00000000000144  -0.00000000016731   0.00000000854648 
-0.00000024982602

  Columns 5 through 8 

   0.00000425716211  -0.00004341427017   0.00032944699074  
0.00012975821094

  Columns 9 through 10 

   0.00113339486260  -0.00036980375227


                        Daniel Tourde
-- 
*********************************************************************
Daniel TOURDE                                   E-mail : address@hidden
The Aeronautical Research Institute of Sweden   Tel : +46 8 634 13 44
P.O. Box 11021 S-161 11 BROMMA, Sweden          Fax : +46 8  25 34 81
*********************************************************************

--- Begin Message --- Subject: Problem with the polynomial approximation Date: Fri, 16 Oct 1998 15:45:38 +0200

Hi !

I am currently using Octave 2.0.13 on a Linux Slackware 3.4 box.

I think I found a bug in the polynomial approximation polyfit. I send as
an attachment my x file (globind.gz) and my y file (displ.gz). When I
call the polyfit function with an order higher than 5 or 6, I obtain
wrong results. The approximation is wrong.

Thanks for any help

Best regards


                        Daniel Tourde
-- 
*********************************************************************
Daniel TOURDE                                   E-mail : address@hidden
The Aeronautical Research Institute of Sweden   Tel : +46 8 634 13 44
P.O. Box 11021 S-161 11 BROMMA, Sweden          Fax : +46 8  25 34 81
*********************************************************************

globind.gz
Description: GNU Zip compressed data

displ.gz
Description: GNU Zip compressed data

--- End Message ---