r - nlsList() error Error in object[[3L]][[1L]] : object of type 'symbol' is not subsettable -


i'm trying run series of non-linear regression in r. models i'm trying fit describe progress of viral population through time @ 3 different temperatures. i'm trying use function nlslist() groupeddata object:

surv <- groupeddata(log10n ~ t | temp, data.frame(cbind(rbind(surv4, surv22,surv56),                                                      temp=rep(c(4, 22, 56),                                                               each=8))))

where log10n log10 of population, t time , temp temperature. nlstools package i'm trying fit mafart model, used mafart model formula create self starter:

mafart.self <- selfstart(~ log10n0-(t/delta)^p, surv,                      parameters=c('p', 'delta', 'log10n0')) getinitial(log10n~mafart.self, data=surv56)

when try initial values following error:

error in object[[3l]][[1l]] : object of type 'symbol' not subsettable

if skip getinitial() step , use nlslist() function follows same error:

> curve.maf <- nlslist(log10n~mafart.self, surv) error in model[[3]][[1]] : object of type 'symbol' not subsettable

i've tried run regressions separately nls2() results totally disappointing, return same values used starters.


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