Re: [R] "Error : singular gradient matrix at initial parameters estimates"

2011-02-15 Thread Mike Marchywka
> Date: Tue, 15 Feb 2011 09:43:25 +0100 > From: mariedidi...@gmail.com > To: r-help@r-project.org > Subject: [R] "Error : singular gradient matrix at initial parameters > estimates" > > Dear all, > > I am a

Re: [R] "Error : singular gradient matrix at initial parameters estimates"

2011-02-15 Thread Ben Bolker
Marie didier gmail.com> writes: > I am a fresh user of R and I already face to problems that I don't > understand. > In the use of the function nls(), I systematically have an error message : > "Singular gradient matrix at initial parameters estimates". > I tried to use nls() on a set of data tha

[R] "Error : singular gradient matrix at initial parameters estimates"

2011-02-15 Thread Marie didier
Dear all, I am a fresh user of R and I already face to problems that I don't understand. In the use of the function nls(), I systematically have an error message : "Singular gradient matrix at initial parameters estimates". I tried to use nls() on a set of data that I subseted from a bigger matrix