Well, here are two attempts that I would have bet on to work, but don't: #Doesn't seems to show up any line at all: abline(a=as.numeric(r1$coefficients["(Intercept)"]), b=as.numeric(r1$coefficients["log(x)"])) #Line doesn't match points: abline(r1, untf=TRUE)
So much for furthering knowledge and this discussion... -Kevin -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of R Heberto Ghezzo, Dr Sent: Thursday, November 01, 2007 1:40 PM To: r-help@r-project.org Subject: [R] problem with log axis Hello, if I do: x <- c(0.5,1,3,6,10,20,40) y <- 10-log(x)+rnorm(7,0,0.05) r1 <- lm(y ~ log(x)) plot(log(x),y) abline(r1) # I get a nice plot with the regression line almost over the points. but: plot(x,y,log="x") abline(r1) gives me exactly the same plot for the points but the regression line is completely off ! I would like the plot with the real values of X on the axis, not the log(X) can somebody tell me why the "abline" is not correct in the second case? Thanks H.Ghezzo McGill University Montreal - Canada ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
