[R] modify rectangle color from image

[Saurav Pathak]

Hi,

I need some suggestion on how I could modify the color on some
rectangle that I have created using image.

In other words, I have a 5x5 matrix, say, m.  

m - matrix(rnorm(25), nrow=5)

I create a grid of rectangles by:

image(m)

Now I want to change the color of rectangle (3,3) to blue. 

I don't know how this could be done, and searching the web has given
me no hint.  

Thanks for your help.

-- 
saurav

__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Re: [R] modify rectangle color from image

[Saurav Pathak]

Thanks,
Saurav


Saurav Pathak [Wed, Jan 24, 2007 at 04:37:20PM -0500]:

+  Hi,
+  
+  I need some suggestion on how I could modify the color on some
+  rectangle that I have created using image.
+  
+  In other words, I have a 5x5 matrix, say, m.  
+  
+  m - matrix(rnorm(25), nrow=5)
+  
+  I create a grid of rectangles by:
+  
+  image(m)
+  
+  Now I want to change the color of rectangle (3,3) to blue. 

using rect for this.

DUH.

-- 
saurav

__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

[R] 3d scatterplots of more than 1 data set

[Saurav Pathak]

hi,

i am need to plot two or more sets of data in a 3d scatterplot,
each set with different color.

i tried Rcmdr, and the 3d scatterplot facility, based on rgl.  that
is what i need.  but i cannot seem to code different sets of data
differently.  any help will be very helpful.

i tried scatterplot3d, but it is difficult to get the right angle in
it.  i need to be able to rotate the axes, and export an eps file
from the right angle.

thanks in advance.
-- 
saurav

__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

[R] multi-color plot

[Saurav Pathak]

hi all,

i am trying to make multi-color plots.  that is, i generally use,

plot(x, y, type=n)
text(x, y, labels=class)

here, the vector class denotes the class of each point.  there are
usually 3-4 classes of points.  how may i display the different
classes in different colors?

thanks for any help.

-- 
saurav

__
[EMAIL PROTECTED] mailing list
http://www.stat.math.ethz.ch/mailman/listinfo/r-help

Re: [R] multi-color plot

[Saurav Pathak]

Thus spake Sundar Dorai-Raj:

+  R plot(x=1:26,y=rep(0:1,13),type=n)
+  R text(x=1:26,y=0.5,labels=letters,col=terrain.colors(26))

now i get it.  what i am doing now is:

R mycol - cls
R mycol[mycol==0] - red
R mycol[mycol==1] - blue
R mycol[mycol==2] - green
R plot(x, y, type=n)
R text(x, y, labels=cls, col=mycol)

which is exactly what i wanted.

thanks!!
saurav

__
[EMAIL PROTECTED] mailing list
http://www.stat.math.ethz.ch/mailman/listinfo/r-help

[R] loading functions from files

[Saurav Pathak]

hi,

i think this is a basic question, but i did not find any
documentation.

i have a file, helloworld.R, which has

helloworld - function() {
  cat(Hello World\n)
}

how may i load this file in R so that i may say at the prompt:

 helloworld()

i am not yet ready to write a package.

thanks,
-- 
saurav

__
[EMAIL PROTECTED] mailing list
http://www.stat.math.ethz.ch/mailman/listinfo/r-help

[R] newbie question on dist

[Saurav Pathak]

hi,

i have just begun using R, so please bear with me.

i am trying to use cmdscale and display the result.  i read the data
using read.table(), calculate the proximity matrix using dist() and
the display the result using the cmdscale().  this is very fine.

in addition, i want the display to distinguish between two classes
of records in my data.  i have my data records marked as 1 or 0.
so i want to display 1's and 0's.  how may i do that?

i use the following code:


 fj - read.table(fj)
  names(fj)
[1] V1 V2 V3 V4 V5 # V5 contains the class mark (1 or 0)
 #
 # since i dont want the class attribute in the distance matrix
 # i create another data.frame dropping it.  but how do i pass it
 # so that I may use it while plotting?
 fjN - data.frame(V1=fj$V1, V2=fj$V2, V3=fj$V3, V4=fj$V4)
 library(mva)
 fjNDist - dist(fjN, method=euclidean)
 fjCMDS - cmdscale(fjNDist)
 plot(x, y, type=n, main=cmdscale(fjNDist))
 text(x, y, ., cex=0.8)


any help will be much appreciated.

thanks,
saurav

__
[EMAIL PROTECTED] mailing list
http://www.stat.math.ethz.ch/mailman/listinfo/r-help