Desculpe Fernando, seguem os dados:
> dput(file)
structure(list(x = 0:372, y = c(1.552918816, 1.177870257,
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)), .Names = c("x", "y"), class = "data.frame", row.names =
c(NA,
-373L))
Boa Tarde,
Eu estou fazendo um fit nâo linear com um polinômio. Porém,
a fiunção que eu estou usando :
y= - {[a*(x^(2*n)) + b]/[(x-186)(x+186)]} apresenta duas
assíntotas em +- 186 e por isso dá um erro no fit: Erro em
numericDeriv(form[[3l]], names(ind), env): obtido valor
faltante ou infinito quando avaliando o modelo.
Pelo que eu entendi, o motivo é que a derivada também possui
assíntotas nestes mesmo postos e daí na função vai para o
infinito.
Eu fiz D( (-(a*(x^(2*n)) + b)/((x-186)(x+186))), "x") e a
mensagem de erro foi: Erro em x^(2*n)argumento não numérico
para operador binário. Aí eu pensei que era por causa do n e
deixei então só o x^2 e o erro foi o mesmo. Eu procurei na
internet e não achei nada que explicasse o que está querendo
dizer. O que seria um operador binário?
Voltando às assintotas, eu achei uma função chamada
‘NLSstAsymptotic(xy)’ que é para assintotas verticais em
gráficos mas eu tentei emplementá-la e nâo deu certo. Tem
outra função que eu possa usar para que o fit seja feito
mesmo que a função usada para o fit apresente
singularidades?