R help - Jun 2006 - plot two graphs with different length of data

Hi I am trying to plot two data set in the same picture window without
overlapping with each other. I am using the format plot(x1,y1,x2,y2)
but get the following error message:
>plot(as.numeric(r0[,4]),as.numeric(r0[,7]),as.numeric(r0[,4]),as.numeric(r0[,7][ind[,1]]))
Error in plot.window(xlim, ylim, log, asp, ...) :
        invalid 'ylim' value

Can anyone tell me what went wrong? Thanks.

Eric

Eric Hu wrote:
> Hi I am trying to plot two data set in the same picture window without
> overlapping with each other. I am using the format plot(x1,y1,x2,y2)
> but get the following error message:
> 
>>
plot(as.numeric(r0[,4]),as.numeric(r0[,7]),as.numeric(r0[,4]),as.numeric(r0[,7][ind[,1]]))
> Error in plot.window(xlim, ylim, log, asp, ...) :
>         invalid 'ylim' value
> 
> Can anyone tell me what went wrong? Thanks.
> 
> Eric
> 
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matplot(cbind(x1,x2), cbind(y1,y2)) might be what you want.

(if x1, x2 and y1,y2 are of equal length. otherwise pad the short  ones 
with NAs or use  `matplot' with type =n (to get the scaling of the plot 
right), followed by `plot(x1,y1), lines(x2,y2)')

Eric Hu wrote:
> Hi I am trying to plot two data set in the same picture window without
> overlapping with each other. I am using the format plot(x1,y1,x2,y2)
> but get the following error message:
> 
> 
>>plot(as.numeric(r0[,4]),as.numeric(r0[,7]),as.numeric(r0[,4]),as.numeric(r0[,7][ind[,1]]))
> 
> Error in plot.window(xlim, ylim, log, asp, ...) :
>         invalid 'ylim' value
> 
> Can anyone tell me what went wrong? Thanks.
plot is probably interpreting one of your data vectors as the ylim 
argument. If you want to plot multiple data series of different lengths, 
it is probably simplest to use points() (or lines()) after plotting the 
first one. For an example of this, see:

http://cran.r-project.org/doc/contrib/Lemon-kickstart/kr_addat.html

Jim