R help - Nov 2010 - Multiple Line Plots with xyplot

I'm trying to make multiple line plots, each with a different color, using
the xyplot command. Specifically, I have an NxK matrix Y and an Nx1 matrix x. I
would like the plot to contain a line for each (x, Y[,i]), i=1:K. I know
something like

xyplot(Y[,1] + Y[,2] + Y[,3] ~ x, type='l')

will work, but if Y is large, this notation can get very awkward. Is there a way
to do something simpler, along the lines of

xyplot(Y ~ x, type='l')

Thanks.

- Elliot

--
Elliot Joel Bernstein, Ph.D. | Research Associate | FDO Partners, LLC
134 Mount Auburn Street | Cambridge, MA | 02138
Phone: (617) 503-4619 | Email: elliot.bernstein at fdopartners.com

On Nov 17, 2010, at 5:38 PM, Elliot Joel Bernstein wrote:
> I'm trying to make multiple line plots, each with a different color,  
> using the xyplot command. Specifically, I have an NxK matrix Y and  
> an Nx1 matrix x. I would like the plot to contain a line for each  
> (x, Y[,i]), i=1:K. I know something like
>
> xyplot(Y[,1] + Y[,2] + Y[,3] ~ x, type='l')
>
> will work, but if Y is large, this notation can get very awkward. Is  
> there a way to do something simpler, along the lines of
>
> xyplot(Y ~ x, type='l')
Perhaps:

x2 <- rep(x, K)
mydat <- data.frame(y =c(Y) , x = x2, id= rep(1:K, each=N)

# not exactly sure I have the N's and K's properly aligned
# but that COULD have been tested with some reproducible data
# which we are both too busy to provide.

xyplot(y ~ x, mydat, groups = id, type="l")
>
> Thanks.
>
> - Elliot
>
> --
> Elliot Joel Bernstein, Ph.D. | Research Associate | FDO Partners, LLC
> 134 Mount Auburn Street | Cambridge, MA | 02138
> Phone: (617) 503-4619 | Email: elliot.bernstein at fdopartners.com
>
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David Winsemius, MD
West Hartford, CT