Hi David,
thanks a lot! Actually, I was looking for the graph since I still
have obtained the table... but It can help...
Best,
Marcio
www.dsr.inpe.br/~mello
On 2/29/12 5:34 PM, David L Carlson wrote:
Something like this?
x<- round(runif(100, 0, 40), 0)
y<- round(runif(100, 0, 40), 0)
xgroup<- cut(x, seq(0, 40, 10), include.lowest=TRUE)
ygroup<- cut(y, seq(0, 40, 10), include.lowest=TRUE)
xy<- table(xgroup, ygroup)
image(xy)
You'll still have to work with the plot commands to label it properly.
----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Marcio Pupin Mello
Sent: Wednesday, February 29, 2012 12:49 PM
To: r-h...@stat.math.ethz.ch
Subject: Re: [R] Frequencies from x/y data into a 2d table (for 3d histogram
or heatmap)
Hi Ralf,
have you solved your problem?! If so, could you share? I have the same
problem...
Best,
Marcio
On 3/25/10 6:03 PM, Ralf B wrote:
Hi all,
I have simple x/y data from screen recording in a sequence:
number,x,y
----------------
1,10,30
1,20,
1,43,110
1,74,18
1,88,112
and would like to create a 3d histogram data structure that i can use
to create a 3d histogram or, more likely a heatmap. The unterlying
data structure therefore needs to look like this:
0-10 11-20 21-30 31-40
0-10
11-20
21-30
31-40
where the values in the cells represent counts of datapoints fitting
respective ranges for x and y. Can somebody point me to a procedure in
R that can make such a transformation for different range sizes (i.e.
10 in my example)? I came across the following method:
https://stat.ethz.ch/pipermail/r-help/attachments/20070425/fcb92205/attachme
nt.pl
which seems (at least close) but did not get it running (could not
find clear3d()). I also dont' need the 3d histogram plot as I will be
using the table to create a heatmap. I might be thinking to
complicated here. To me, it seems like this should be possible with a
few lines of code. Perhaps one of you has them lying around somewhere
or knows a script that does the trick.
Thanks in advance!
Ralf
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