Hi Please keep conversation on list somebody can have better idea. Other see in line.
> -----Original Message----- > From: Jianling Fan [mailto:fanjianl...@gmail.com] > Sent: Friday, July 31, 2015 4:46 PM > To: PIKAL Petr > Subject: Re: [R] About nls. > > Hello, Petr, > > Thanks for your help. > That works but it change my model. And I think that's not the main > problem. > from my data, (den1/R1+den2+den3+den4+den5/R5) always <1, which makes > (1/(den1/R1+den2+den3+den4+den5/R5)-1)>0. It is not true unless I have different data from yours. > with(dat,(den1/0.9+den2+den3+den4+den5/23)) [1] 0.4655556 0.7472222 0.9755556 1.0733333 1.1100000 0.3800000 [7] 0.4800000 0.8500000 0.8800000 1.0000000 0.4800000 0.8900000 [13] 0.9800000 0.9900000 1.0000000 0.2000000 0.3900000 0.6900000 [19] 0.9900000 1.0000000 6.0652174 9.9065217 13.3434783 16.5782609 [25] 18.8021739 19.8130435 > with(dat,(1/(den1/.9+den2+den3+den4+den5/23)-1)>0) [1] TRUE TRUE TRUE FALSE FALSE TRUE TRUE TRUE TRUE FALSE TRUE TRUE [13] TRUE TRUE FALSE TRUE TRUE TRUE TRUE FALSE FALSE FALSE FALSE FALSE [25] FALSE FALSE > > str(dat) 'data.frame': 26 obs. of 7 variables: $ Depth: int 20 40 60 80 100 15 30 45 60 120 ... $ lnd : num 3 3.69 4.09 4.38 4.61 ... $ den1 : num 0.419 0.672 0.878 0.966 0.999 ... $ den2 : num 0 0 0 0 0 0.38 0.48 0.85 0.88 1 ... $ den3 : num 0 0 0 0 0 0 0 0 0 0 ... $ den4 : num 0 0 0 0 0 0 0 0 0 0 ... $ den5 : num 0 0 0 0 0 0 0 0 0 0 ... > > dput(dat) structure(list(Depth = c(20L, 40L, 60L, 80L, 100L, 15L, 30L, 45L, 60L, 120L, 15L, 30L, 45L, 60L, 120L, 15L, 30L, 45L, 60L, 120L, 10L, 30L, 50L, 70L, 90L, 110L), lnd = c(2.995732, 3.688879, 4.094345, 4.382027, 4.60517, 2.70805, 3.401197, 3.806662, 4.094345, 4.787492, 2.70805, 3.401197, 3.806662, 4.094345, 4.787492, 2.70805, 3.401197, 3.806662, 4.094345, 4.787492, 2.302585, 3.401197, 3.912023, 4.248495, 4.49981, 4.70048), den1 = c(0.419, 0.6725, 0.878, 0.966, 0.999, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), den2 = c(0, 0, 0, 0, 0, 0.38, 0.48, 0.85, 0.88, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), den3 = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.48, 0.89, 0.98, 0.99, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), den4 = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.2, 0.39, 0.69, 0.99, 1, 0, 0, 0, 0, 0, 0), den5 = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 139.5, 227.85, 306.9, 381.3, 432.45, 455.7)), .Names = c("Depth", "lnd", "den1", "den2", "den3", "den4", "den5"), class = "data.frame", row.names = c("1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26")) > You can check if this is the same as you have. That is why it is preferable to use dput for sending data. Cheers Petr > So, the nls should work in this case. But I don't know why it does not. > > Thanks! > > Regards, > > Julian > > > > On 31 July 2015 at 00:54, PIKAL Petr <petr.pi...@precheza.cz> wrote: > > Hi > > > > I am not an expert but the problem seems to me that > > > > (den1/R1+den2+den3+den4+den5/R5)-1 > > > > gives you sometimes value 0 and sometimes negative. In these cases > the value of log(1/result) is NA or Inf and nls can not handle this. > > > > I do not search vhere is nls2 from so I used nls and removed -1 form > your formula, which resulted to some final values. > > > >> fit1<-nls(lnd~log(1/(den1/R1+den2+den3+den4+den5/R5))/c+log(d50), > > + start=c(R1=0.9, R5=23, c=-1.1, d50=10), data=test) > >> > >> coef(fit) > > A B > > 6.9720965 -0.0272203 > >> coef(fit1) > > R1 R5 c d50 > > 0.9622249 416.1272498 -0.7178156 73.6017161 > >> > > Cheers > > Petr > > > >> -----Original Message----- > >> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of > >> Jianling Fan > >> Sent: Thursday, July 30, 2015 9:51 PM > >> To: r-help@r-project.org > >> Subject: [R] About nls. > >> > >> Hello, > >> > >> I am trying to do a nls regression with R. but I always get a error > >> as "Error in numericDeriv(form[[3L]], names(ind), env) : Missing > >> value or an infinity produced when evaluating the model". I googled > >> it and found someone said it is because of the improper start value. > >> I tried many times but can not solve it. Does anyone can help me? > >> > >> thanks a lot ! > >> > >> my code is: > >> > >> fit1<-nls2(lnd~log(1/(den1/R1+den2+den3+den4+den5/R5)-1)/c+log(d50), > >> start=c(R1=0.9, R5=23, c=-1.1, d50=10), data=SWrt) > >> > >> data (SWrt) is: > >> > >> Depth lnd den1 den2 den3 den4 den5 > >> 1 20 2.995732 0.4190 0.00 0.00 0.00 0.00 > >> 2 40 3.688879 0.6725 0.00 0.00 0.00 0.00 > >> 3 60 4.094345 0.8780 0.00 0.00 0.00 0.00 > >> 4 80 4.382027 0.9660 0.00 0.00 0.00 0.00 > >> 5 100 4.605170 0.9990 0.00 0.00 0.00 0.00 > >> 6 15 2.708050 0.0000 0.38 0.00 0.00 0.00 > >> 7 30 3.401197 0.0000 0.48 0.00 0.00 0.00 > >> 8 45 3.806662 0.0000 0.85 0.00 0.00 0.00 > >> 9 60 4.094345 0.0000 0.88 0.00 0.00 0.00 > >> 10 120 4.787492 0.0000 1.00 0.00 0.00 0.00 > >> 11 15 2.708050 0.0000 0.00 0.48 0.00 0.00 > >> 12 30 3.401197 0.0000 0.00 0.89 0.00 0.00 > >> 13 45 3.806662 0.0000 0.00 0.98 0.00 0.00 > >> 14 60 4.094345 0.0000 0.00 0.99 0.00 0.00 > >> 15 120 4.787492 0.0000 0.00 1.00 0.00 0.00 > >> 16 15 2.708050 0.0000 0.00 0.00 0.20 0.00 > >> 17 30 3.401197 0.0000 0.00 0.00 0.39 0.00 > >> 18 45 3.806662 0.0000 0.00 0.00 0.69 0.00 > >> 19 60 4.094345 0.0000 0.00 0.00 0.99 0.00 > >> 20 120 4.787492 0.0000 0.00 0.00 1.00 0.00 > >> 21 10 2.302585 0.0000 0.00 0.00 0.00 139.50 > >> 22 30 3.401197 0.0000 0.00 0.00 0.00 227.85 > >> 23 50 3.912023 0.0000 0.00 0.00 0.00 306.90 > >> 24 70 4.248495 0.0000 0.00 0.00 0.00 381.30 > >> 25 90 4.499810 0.0000 0.00 0.00 0.00 432.45 > >> 26 110 4.700480 0.0000 0.00 0.00 0.00 455.70 > >> > >> ______________________________________________ > >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >> https://stat.ethz.ch/mailman/listinfo/r-help > >> PLEASE do read the posting guide http://www.R-project.org/posting- > >> guide.html and provide commented, minimal, self-contained, > >> reproducible code. > > ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. 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