R help - May 2008 - Nonlinear regression

Could someone help me on the following:
SAS has DUD (Does not Use Derivatives) for nonlinear regression.

Does "R" has a similar capability?

I am not good at derivatives and may get my derivative wrong before 
feeding it to a nonlinear regression procedure.

Any help would be much appreciated. 

Liu
Hancock Forest Management NZ
Tokoroa, New Zealand 
DDI: 07-8850387
Mobile: 021-1576178
A/H: 06 868 4288
lxu@hnrg.com


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?nls

(I always knew SAS *is* a DUD, but never that it has a DUD too...) 


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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of LXu at hnrg.com
Sent: Wednesday, 21 May 2008 9:23 AM
To: r-help at r-project.org
Subject: [R] Nonlinear regression

Could someone help me on the following:
SAS has DUD (Does not Use Derivatives) for nonlinear regression.

Does "R" has a similar capability?

I am not good at derivatives and may get my derivative wrong before 
feeding it to a nonlinear regression procedure.

Any help would be much appreciated. 

Liu
Hancock Forest Management NZ
Tokoroa, New Zealand 
DDI: 07-8850387
Mobile: 021-1576178
A/H: 06 868 4288
lxu at hnrg.com


The information contained in this email and any attachments is strictly 
confidential and is for the use of the intended recipient.  Any use, 
dissemination, distribution, or reproduction of any part of this email
or 
any attachment is prohibited.  If you are not the intended recipient, 
please notify the sender by return email and delete all copies including

attachments.
	[[alternative HTML version deleted]]

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LXu at HNRG.COM wrote:
> Could someone help me on the following:
> SAS has DUD (Does not Use Derivatives) for nonlinear regression.
> 
> Does "R" has a similar capability?
> 
nls()

-- 
Mike Prager, NOAA, Beaufort, NC
* Opinions expressed are personal and not represented otherwise.
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