Re: [R] nls with some coefficients fixed

2010-07-21 Thread Keith Jewell
Gabor Grothendieck ggrothendi...@gmail.com wrote in message news:aanlktilszaicycu3lz2f5d_bxq1g8m8f7jsjsbj2l...@mail.gmail.com... On Tue, Jul 20, 2010 at 9:58 AM, nas...@uottawa.ca wrote: For nls, the fixing (or masking) of parameters is not, to my knowledge, possible. This is something

Re: [R] nls with some coefficients fixed

2010-07-21 Thread Keith Jewell
Gabor Grothendieck ggrothendi...@gmail.com wrote in message news:aanlktilszaicycu3lz2f5d_bxq1g8m8f7jsjsbj2l...@mail.gmail.com... On Tue, Jul 20, 2010 at 9:58 AM, nas...@uottawa.ca wrote: For nls, the fixing (or masking) of parameters is not, to my knowledge, possible. This is something

[R] nls with some coefficients fixed

2010-07-20 Thread nashjc
For nls, the fixing (or masking) of parameters is not, to my knowledge, possible. This is something I've been trying to get in such routines for over 2 decades. Masks are available, but not yet well documented, in Rcgmin and Rvmmin packages. However, these use an optim() style approach, which is

Re: [R] nls with some coefficients fixed

2010-07-20 Thread Keith Jewell
nas...@uottawa.ca wrote in message news:33466.129.6.253.2.1279634282.squir...@webmail02.uottawa.ca... For nls, the fixing (or masking) of parameters is not, to my knowledge, possible. This is something I've been trying to get in such routines for over 2 decades. Masks are available, but not

Re: [R] nls with some coefficients fixed

2010-07-20 Thread Gabor Grothendieck
On Tue, Jul 20, 2010 at 9:58 AM, nas...@uottawa.ca wrote: For nls, the fixing (or masking) of parameters is not, to my knowledge, possible. This is something I've been trying to get in such routines for over 2 decades. Masks are available, but not yet well documented, in Rcgmin and Rvmmin

[R] nls with some coefficients fixed

2010-07-19 Thread Keith Jewell
I'm using nls to fit a variety of different models. Here I use SSgompertz as an example. I want the ability to fix one (or more) of the coefficients that would normally be optimised (e.g. fix b3=0.8). Examples; based on and using data from example(SSgompertz) #- # vanilla