R help - Feb 2011 - Plot colour according to column

Hi,

I am trying to plot several columns in different graphs in columns and rows.
The first column of my data file is the time, and the third is the
'elevation angle' with 19 different numbers. I would like to plot the
rest
of the columns with the x axis as time and the individual angles in
different colours.

Here is the code I am using right now. It plots the different columns with
time, but I didn't know how to make the third column as the colour filter.

------
maduplot<-function(mydata) {
par(mfrow=c(5,3),mar=c(2,2,2,2)) 

for(i in 2:ncol(mydata)) {
plot(mydata[,i]~mydata[,1]
,type="l" 
,xlab=colnames(mydata)[1]
,ylab=colnames(mydata)[i]
,main=colnames(mydata)[i])

grid(col="black",lwd=0.2,lty=1) 
}
}

HCHO <-read.table("qdoas.qdo", header=TRUE)

maduplot(HCHO)

------

A sample dataset is attached.

http://r.789695.n4.nabble.com/file/n3275655/QDOAS.qdo QDOAS.qdo 
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On 02/08/2011 09:14 PM, anoopmj wrote:
>
> Hi,
>
> I am trying to plot several columns in different graphs in columns and
rows.
> The first column of my data file is the time, and the third is the
> 'elevation angle' with 19 different numbers. I would like to plot
the rest
> of the columns with the x axis as time and the individual angles in
> different colours.
>
Hi anoopmj,
I'm not sure that I understand what you want to do, but perhaps this 
will help:

HCHO$time<-strptime(HCHO$V1,format="%H:%M:%S")
plot(HCHO$time,HCHO$V4,type="h",col=HCHO$colors)
HCHO<-read.table("qdoas.qdo",sep="\t")

Jim

Hi Anoop,

Not sure whether it's too late for you, but is this along the lines of
what you want?:

x<-0:1000
y<-sin(x/500)+rnorm(1001)/10
z<-cos(x/500)+rnorm(1001)/100
plot(x,y,col=rgb(1,(z-min(z))/(max(z)-min(z)),0))

Or possibly like:

plot(x,y,col=rainbow(256)[255*(z-min(z))/(max(z)-min(z))])

Mind that the binning could be done a bit more conscientious ;)

Hope it helps,

Tsjerk

On Wed, Feb 9, 2011 at 6:30 PM, anoopmj <anoopmj at gmail.com>
wrote:
>
> Hi Jim,
>
> Thanks a lot for the response. I finally decided to do it with ggplot2
> library, qplot and layers. It works pretty well, although I did not know
how
> to get the time working... so thanks!
>
> Anoop
> --
> View this message in context:
http://r.789695.n4.nabble.com/Plot-colour-according-to-column-tp3275655p3297750.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide
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>


--
Tsjerk A. Wassenaar, Ph.D.

post-doctoral researcher
Molecular Dynamics Group
* Groningen Institute for Biomolecular Research and Biotechnology
* Zernike Institute for Advanced Materials
University of Groningen
The Netherlands



-- 
Tsjerk A. Wassenaar, Ph.D.

post-doctoral researcher
Molecular Dynamics Group
* Groningen Institute for Biomolecular Research and Biotechnology
* Zernike Institute for Advanced Materials
University of Groningen
The Netherlands