[R] persp plot

From: Chad Junkermeier <junkermeier_at_byu.edu>
Date: Tue, 24 Jun 2008 11:39:05 -0400


I have a set of data in the form
x1, y1, z1
x1, y2, z2
...

x1, yN, zN
x2, y1, z(N+1)
x2, y2, z(N+2)

...


x2, yN, z(2N)
...and so on...

xM, yN, val(M*N)

I have been trying to figure out how to get R to use this data in a persp plot. So far the only thing that I can figure out to do is to break the data file into three different files. The first file contains the x-coordinate data:
x1
x2
...

xM
The second file contains the data
y1
y2
...

yN
And finally the last file contains the data for the z-axis. z1
z2
...

z(M*N)
Once I have the three data files created I use them in the following R script:

cat << EOF | R --no-save
def.par <- par(no.readonly = TRUE)

en_range <- c(-6.2, 0.0)
om_range <- c(-200.0, 500.0)
ze_range <- c(0.0, 1.0)

z_perspective <-c(0,3)
xdata <- scan("x.txt", list(0))
ydata <- scan("y.txt", list(0))
zdata <- scan("z.txt", list(0))

f <- function(xdata,ydata) { rr <- zdata; rr } z <- outer(xdata, ydata, f)

pdf(file="persp.pdf",height = 8, width =8)

persp(xdata, ydata, z, axes = TRUE, nticks = 5, ticktype = "detailed",r=1.5)

dev.off()

q()

EOF The problem is that when I look at the plot, the peaks of the zdata are i
The problem is that when I look at the plot, the peaks of the zdata are in the wrong places on the x axis. I have carefully looked over my data files and I am confident that they are correct. Thus I believe that the error is in my R script; most likely in the following lines

f <- function(xdata,ydata) { rr <- zdata; rr } z <- outer(xdata, ydata, f)

Do you have any suggestions?

Chad Junkermeier, Graduate Student
Dept. of Physics
West Virginia University
PO Box 6315
210 Hodges Hall
Morgantown WV 26506-6315



Concurrently at:
Dept. of Physics and Astronomy
Brigham Young University
Provo UT 84602

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