Message-ID: <200503091326.18175.deepayan@stat.wisc.edu>
Date: 2005-03-09T19:26:18Z
From: Deepayan Sarkar
Subject: Aid with 3-D scatterplots
In-Reply-To: <820a93e60855459800d565ab995091f4@joimail.com>
On Wednesday 09 March 2005 13:17, Jim and Chana Milks wrote:
> I am attempting to classify pixels from a Landsat image by using their
> associated numbers in bands 2, 3, and 4 (It's from an assignment on
> classification). To aid me, I want to create a 3-D scatterplot using
> the "cloud" command. Due to my ignorance of the finer plotting
> functions, I am unable to display the scale on the three axes or to
> display the grid.
>
> My dataframe (RS) contains four columns: Class, band2, band3, band4.
> Class is the classification variable (vegetation, water, soil, etc.)
>
> The basic code I used was:
> cloud(band4~band2*band3,RS,xlab="TM Band 2",ylab="TM Band 3",zlab="TM
> Band 4",group=RS$Class).
Just 'groups = Class' should work.
>
> Unfortunately, I'm unsure which arguments to use and how to write them
> in. I've tried adding arguments using "scale", but have not been
> successful, mostly because I'm unsure which arguments apply. The scale
> I want for all three axes is 0-100.
You want
cloud(..., xlim = c(0, 100), ylim = c(0, 100), zlim = c(0, 100))
and perhaps
cloud(..., xlim = c(0, 100), ylim = c(0, 100), zlim = c(0, 100),
scales = list(arrows = FALSE))
-Deepayan