I'm not sure if there is a single function, but a quick script would look something like this and would be easily adjusted
attach(mtcars) mtcars.ls <- loess(mpg~wt*hp) wtg <- seq(min(wt), max(wt), length.out=50) hpg <- seq(min(hp), max(hp), length.out=50) grid <- expand.grid(wt=wtg, hp=hpg) mpg.fit <- predict(mtcars.ls, grid) contour(wtg, hpg, mpg.fit, xlab="Weight (1,000 lbs)", ylab="Horsepower") points(wt, hp, pch=20) ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of ivo welch Sent: Thursday, November 21, 2013 10:35 PM To: r-help Subject: [R] xyz-contour plot (irregular grid) Dear R users: before I try to undertake my own rewrite, has anyone already written a contour function that does not require a regularly spaced grid, preferably plot.contour(x,y,z,...)? (it would be nice if it were based on loess() and plot()? further annotations, changes, etc., would then be easier.) sincerely, /iaw ---- Ivo Welch (ivo.we...@gmail.com) [[alternative HTML version deleted]] ______________________________________________ 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.
