| T O P I C R E V I E W |
| hauli |
Posted - 09/22/2006 : 06:34:59 AM
Origin Version (Select Help-->About Origin): 7.5
Operating System: Windows XP
Since two days my NLSF tool does not work correctly; whenever I try to use user-definded equations, after the first iteration I get the Error message "28037" (parameters not initialised correctly or problems with the user-defined equation (or something like that))
with the built in equations everything runs without problems
since (knowingly) I did not change anything in relation to historical evaluations, what can be the reasons for that sudden problems? And how can I get rid of them?
I searched the forum for "error 28037" and found that this problem occured for a few times in the past, but unfortunately I did not find any solution.
Thanks for your suggestions,
hauli
Edited by - hauli on 09/22/2006 06:36:07 AM |
| 2 L A T E S T R E P L I E S (Newest First) |
| hauli |
Posted - 09/27/2006 : 07:32:58 AM
Dear Mike!
The problem was not one of unreasonable initial values, but
that unreasonable values for DELTA and MINIMUM/MAXIMUM were used.
(I don't know, where they came from)
setting them back to reasonable values, everything works fine
NLSF is a great tool!
Hauli
|
| Mike Buess |
Posted - 09/22/2006 : 08:00:49 AM
Built in functions automatically estimate starting values of parameters but user-defined functions typically do not. Sounds like you simply need to enter reasonable initial values for your parameters before starting the fit.
Mike Buess
Origin WebRing Member |
