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...got the error: singular gradient matrix at initial parameter estimates I thought it was due to a low number of points (6), but when I create a dataset, I get the same problem. If I remove the parameter "a," then it can find a solution. Does anyone know what I can do to fit this model? vardata<- rnorm(73,mean=0,sd=5) x<-0:72 a<-1 b<-50 k<-0.05 l<-5 startt<-c(a,b,k,l) yf<-a+b*(1-exp(-k*(x-l))) y<-yf+vardata nmodel<-nls(y~a+b*(1-exp(-k*(x-l))), start=list(a=1,b=50,k=0.05,l=5)) -- View this message in context: http://r.789695.n4.nabble.com/nls-not...

...ng times of market uncertainty. my current rfile is below. library(SparseM) library(quantreg) library(zoo) library(nortest) library(MASS) library(fEcofin) library(mvtnorm) library(ccgarch) library(stats) library(foreign) #dataset<-read.csv(file="xxxx",header=FALSE) attach(dataset); vardata=data.frame(dataset[,2],dataset[,4]) ### DCC ### #initial values a1 <- c(0.003, 0.001, 0.001) A1 <- diag(c(0.1,0.1,0.1)) B1 <- diag(c(0.1, 0.1, 0.1)) dcc.para <- c(0.01,0.98) # Estimating a DCC-GARCH(1,1) model dcc.results <- dcc.estimation(inia=a, iniA=A, iniB=B, ini.dcc=dcc.para,...

hi, I would like to find the x value (independent variable) for a certain dependent value using the fitted model with nls. with (predict) I can find y that corresponds to a list of x. I need the other way around. can it be done? thanks, afadda

...ed_g80as_hack = 1, .prep = gm107_prep, + .trootas = tabrootas, + .tsched = tabsched, + .schedpos = 0x20, }; diff --git a/include/dis.h b/include/dis.h index 5565170..a2366b9 100644 --- a/include/dis.h +++ b/include/dis.h @@ -41,6 +41,9 @@ struct disisa { void (*prep)(struct disisa *); struct vardata *vardata; uint32_t (*getcbsz)(const struct disisa *isa, struct varinfo *varinfo); + struct insn *trootas; + struct insn *tsched; + int schedpos; }; struct label { -- 2.7.3