Hi,
i am sure, that this is a noob-question, but i have searched for
hours without any good result.
I want to draw a vertical line through the maximum of the first derivation.
Here is a small example.
--8<-----[mydata.csv]--------------------------------
H M
1 15
2 22
3 23
4 17
5 10
--8<-----[myquestion.R]------------------------------
mydata <- read.table("mydata.csv", header=TRUE, sep="\t")
attach(mydata)
# make a smooth fit through the points and calculate the first derivation d/dx
myspl <- smooth.spline(H, M, all.knots = FALSE, nknots = 10, spar=0.5)
mydiff <- predict(myspl, 0:max(H), deriv=1)
# find the maximum peak max(y)
y1=y2= max(mydiff$y)
# now i want to plot a line through the maximum of the derivation
# how can i get the x-coordinate?
# segments(x1,y1,x2,y2)
detach()
--8<-------------------------------------
Thank you,
--
Jonas Stein
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