[R] adding column and pulling data from table

[Peter Alspach]

Paul

It is not entirely clear to me what you want to do.  However, if you are
wanting to add row names then try

row.names(dat) <- paste('g', 1:nrow(dat), sep='')

First twenty rows of columns 1:3 are obtained by

dat[1:20,1:3]

Regarding putting all the points in a column onto a scatterplot.  One
usually has two variates for a scatterplot.  Thus to make a scatter plot
of column 2 against column 1

plot(dat[,1], dat[,2])

Incidentally, subsetting is covered in the introductory manual and some
online texts.

HTH ......

Peter Alspach


> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Paul Adams
> Sent: Wednesday, 4 June 2008 7:08 a.m.
> To: r-help at r-project.org
> Subject: [R] adding column and pulling data from table
> 
> Hello to everyone,
> I have a general question about how to add a column to a 
> table.I have a table that has 62 columns and 2000 rows.I am 
> wanting to add a column on the left most row.I am wanting to 
> label the rows g1 to g2000 I have the code of 
> ("g",c(1:nrow(dat)),sep="") for the right side of the 
> assignment but do not know what function to use for the left 
> side of the equation.I also have a similiar question as to 
> how to select a particular portion of the table and to plot 
> this. For example to select column 1 and 3 and to take the 
> data from the first twenty rows from those columns and put 
> this data onto a plot which I have allready coded.Lastly I 
> would like to take all the points in a column (2000) and put 
> them into a scatter plot.What is the command or function I 
> would use to do this?
> Thank You
> Paul
> 
> 
>       
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> 
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