Hi all,
I have a x, y matrix of numbers (usually ranging from 0 to 40). I need
to group these numbers and assign a color to each group (for example 0
to 15 - Blue, 16-30- Yellow, and 31-40- Red). Then I need to draw a
rectangular matrix which contains X x Y boxes and each box has the
corresponding value from the input matrix and is also colored according
to which group (i.e red, yellow, or blue) that value falls into.
I have used the color2D.matplot function from the plotrix package, but
I cant quite figure out how to group the values to represent red blue
and yellow colors.
Thanks
Kartik
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Sounds like ?image what you are looking for, perhaps?
Bert Gunter
Genentech Nonclinical Statistics
South San Francisco, CA 94404
650-467-7374
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Pappu, Kartik
Sent: Thursday, March 22, 2007 3:42 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Colored boxes with values in the box
Hi all,
I have a x, y matrix of numbers (usually ranging from 0 to 40). I need
to group these numbers and assign a color to each group (for example 0
to 15 - Blue, 16-30- Yellow, and 31-40- Red). Then I need to draw a
rectangular matrix which contains X x Y boxes and each box has the
corresponding value from the input matrix and is also colored according
to which group (i.e red, yellow, or blue) that value falls into.
I have used the color2D.matplot function from the plotrix package, but
I cant quite figure out how to group the values to represent red blue
and yellow colors.
Thanks
Kartik
----------------------------------------------------------
IMPORTANT WARNING: This email (and any attachments) is only...{{dropped}}
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Pappu, Kartik wrote:> Hi all, > > I have a x, y matrix of numbers (usually ranging from 0 to 40). I need > to group these numbers and assign a color to each group (for example 0 > to 15 - Blue, 16-30- Yellow, and 31-40- Red). Then I need to draw a > rectangular matrix which contains X x Y boxes and each box has the > corresponding value from the input matrix and is also colored according > to which group (i.e red, yellow, or blue) that value falls into. > > I have used the color2D.matplot function from the plotrix package, but > I cant quite figure out how to group the values to represent red blue > and yellow colors. >Hi Kartik, color2D.matplot isn't designed for this, but with a few tricks, I think you can get what you want. Try this: xmat<-matrix(sample(0:40,100,TRUE),nrow=10) # trick 1 - calculate values that give you the colors for ranges color2D.matplot(floor(xmat/15+1),c(1,1,0),c(0,1,0),c(0,0,1)) # trick 2 - Use boxed.labels rather than the inbuild value display boxed.labels(sort(rep(9.5:0.5,10)),rep(seq(9.5,0.5,by=-1),10),xmat) # trick 3 - Use color.legend to show the group colors color.legend(0,-2,3,-1.3,1:3,c("red","yellow","blue")) You will have to wait until plotrix v2.2 is on CRAN as I am just submitting it, and the color.legend function, requested only a few weeks ago, is new to that version. Jim