Le 08/04/2014 04:20, David Doyle a écrit :
Hello folks,
When I use the lines function below it connects all my points but then
draws a line back to the start point. Any suggestions on what is going on??
mydata <-read.csv("http://doylesdartden.com/R/test_data.csv";, sep=",")
attach(mydata)
plot(EMD~Year,data=mydata, subset = Well.ID %in% c("MW-1", "D_EMD"),
col=ifelse(D_EMD, "black", "red"), pch=ifelse(D_EDM, 19, 17), cex = 1.5)
lines(EMD~Year)
Thank you for your time.
David
First, there is a typo error here:
pch=ifelse(D_EMD, 19, 17)
Second try this to see that year data are not monotonically increasing.
Then it produces the zig-zag effect that you observe:
plot(1990:2000, c(rep(0, 10), 10), type="n")
lines(EMD~Year)
It can be seen here also:
diff(Year)
or
diff(Year)<0
Sincerely,
Marc
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