Thanks for your reply.
When I did what you said
z - t(matrix(zdata, nrow = length(ydata)))
persp(xdata, ydata, z)
I got the following errors:
Error in persp.default(xdata, ydata, z) : invalid 'x' argument
Calls: persp - persp.default
In addition: Warning messages:
1: In min(x, na.rm = na.rm) :
no non-missing arguments to min; returning Inf
2: In max(x, na.rm = na.rm) :
no non-missing arguments to max; returning -Inf
3: In min(x, na.rm = na.rm) :
no non-missing arguments to min; returning Inf
4: In max(x, na.rm = na.rm) :
no non-missing arguments to max; returning -Inf
Execution halted
On Jun 24, 2008, at 2:07 PM, Franz Mueter wrote:
Chad -
I think what you want (after reading in your data) is:
z - t(matrix(zdata, nrow = length(ydata)))
persp(xdata, ydata, z)
Cheers, Franz
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
] On
Behalf Of Chad Junkermeier
Sent: Tuesday, June 24, 2008 7:39 AM
To: r-help@r-project.org
Subject: [R] persp plot
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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