### Not currently working on this

# library(ggplot2)
# 
# data(Orange)
# 
# tree3 <- subset(Orange, Tree == 3)
# 
# fm0 <- nls(circumference ~ SSlogis(age, Asym, xmid, scal), data = tree3)
# 
# ggplot(data = tree3, aes(x = age, y = circumference)) + 
#   geom_point() + 
#   geom_line(aes(y = fitted(fm0)))
# 
# tree31 <- data.frame(age = c(tree3$age, 1900, 2200, 2400, tree3$age + 3000, 
#                              5000, 5600),
#                     circumference = c(tree3$circumference,
#                                       150, 155, 153,
#                                       tree3$circumference + 150,
#                                       300, 305))
# 
# ggplot(data = tree31, aes(x = age, y = circumference)) + 
#   geom_point()
# 
# getInitial(circumference ~ SSdlogis7(age, y.min, 
#                                      y.mid, 
#                                      y.max,
#                                      xmid1, scal1, xmid2, scal2), 
#            data = tree31)
# 
# getInitial(circumference ~ SSdlogis4(age, yt, 
#                                      yd, 
#                                      xmid, scal),
#            data = tree31)
# 
# fm1 <- minpack.lm::nlsLM(circumference ~ SSdlogis7(age, y.min, 
#                                           y.mid,
#                                           y.max,
#                                           xmid1, 
#                                           scal1, 
#                                           xmid2,
#                                           scal2),
#                          data = tree31)
# 
# 
# fm1 <- minpack.lm::nlsLM(circumference ~ SSdlogis4(age, yt, 
#                                      yd, 
#                                      xmid, scal),
#            data = tree31, 
#            control = list(maxiter = 1000))
# 
# ggplot(data = tree31, aes(x = age, y = circumference)) + 
#   geom_point() + 
#   geom_line(aes(y = fitted(fm1)))
# 
# grd <- expand.grid(yt = seq(0, 300, length.out = 10),
#                    yd = seq(0, 300, length.out = 10),
#                    xmid = seq(0, 5000, length.out = 10),
#                    scal = seq(0, 1000, length.out = 10))
# 
# fm.bf <- nls2(circumference ~ dlogis4(age, yt, 
#                                         yd, 
#                                         xmid, scal),
#               start = grd,
#               algorithm = "brute",
#               data = tree31)
# 
# xx <- 1:5000
# yy <- dlogis4(xx, yt = 150, yd = 150, xmid = 2500, scal = 400)
# 
# plot(xx, yy)
# 
# 
# xx <- 1:6000
# yy <- dlogis7(xx, y.min = 30, y.mid = 150, y.max = 300, 
#               xmid1 = 1500, scal1 = 300, xmid2 = 4200, scal2 = 300)
# 
# plot(xx, yy)
# 
# ggplot() + 
#   geom_point(data = tree31, aes(x = age, y = circumference)) + 
#   geom_line(aes(x = xx, y = yy))
# 
# fm1 <- minpack.lm::nlsLM(circumference ~ dlogis7(age, y.min, 
#                                                    y.mid,
#                                                    y.max,
#                                                    xmid1, 
#                                                    scal1, 
#                                                    xmid2,
#                                                    scal2),
#                          data = tree31, 
#                          start = c(y.min = 0, y.mid = 150, y.max = 300,
#                                    xmid1 = 700, scal1 = 300,
#                                    xmid2 = 4200, scal2 = 200))