[R] R] nls model singular gradient matrix at initial parameter, > estimates

00 > From: oussama belmejdoub > To: "r-help@r-project.org" > Subject: [R] nls model singular gradient matrix at initial parameter > estimates > Message-ID: > Content-Type: text/plain; charset="iso-8859-1" > > Greetings, > I'm trying to use

[R] nls model singular gradient matrix at initial parameter estimates

Greetings, I'm trying to use the nls function in my statistics project but I'm really finding lot of difficulties. I have a function called apinene_modele_prediction that calculates the estimations: library(expm); #exp of a matrixapinene_modele_prediction <- function(t,theta) { x0=c(100,0,0,0,0)