[R] data frame output in loops

[Apoian, Zack]

I know this is very basic--I'm wondering if there is a  way to write data 
frames as outputs from a loop.
In other words, take this simple example:
 
> a <- data.frame(x = c(1,2,3,4), y = c(1,2,1,2))
 
Given a, how would you write a loop that creates two data frames, x and y, 
where the first column is a column of a and the second column is two times the 
first column, or:
 
> x
  x.1 x.2
1   1   2
2   2   4
3   3   6
4   4   8

 
and 
 
> y
  y.1 y.2
1   1   2
2   2   4
3   1   2
4   2   4

 


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[R] plotting multiple series in one plot

[Apoian, Zack]

say we have:

> x<-data.frame(a=c(1,2,3,4,5),b=c(1,1,1.5,2,2))
> y<-data.frame(a=c(1,2,3,4,5),b=c(1,2,2,3,3))

How would I plot this so that, with the shared $a as the x-axis values, I
have both $b columns plotted together?  (a comparison of the two?)

thanks.


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[R] referencing values of strings

[Apoian, Zack]

Say you have a vector named x and a function which returns the character
string "x" .  How would I take "x" as an input and return the vector x?


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[R] plot question

[Apoian, Zack]

Say y and z are two time series (functions of "date").  What is the R
command to plot y and z together on a graph with "date" on the x-axis?



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