Message-ID: <027001cee797$d3185bf0$794913d0$@tamu.edu>
Date: 2013-11-22T15:30:50Z
From: David L Carlson
Subject: xyz-contour plot (irregular grid)
In-Reply-To: <CAPr7RtXG-+mfUef7KFcduwXM=-vn=-S3jtROc7cW88a1nz1e9w@mail.gmail.com>
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-bounces at r-project.org
[mailto:r-help-bounces at 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.welch at gmail.com)
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