R help - Feb 2003 - multiple plot overlay - dataframe

I hope you could help me with this. I have a dataframe
with 5 columns, the first column determining the X
values, and the rest four determining four separate Y
vectors. How can I plot them on the same graph,
overlaying each other?
Thanks.

Elena Zheleva

Here's one idea:

df <- ...

# Create an empty plot big enough to fit all data points
xlim <- range(df[,1], na.rm=TRUE)
ylim <- range(df[,-1], na.rm=TRUE)
plot(NA, xlim=xlim, ylim=ylim, xlab="x", ylab="y")

# For each Y column, plot the data against the X column
for (k in 2:ncol(df))
  points(df[,1], df[,k], col=k-1)  # Works with lines() too!

and here is another one that assumes a scatter plot:

xs <- rep(df[,1], times=ncol(df)-1)
ys <- as.vector(as.matrix(df[,-1]))
col <- rep(1:5, each=nrow(df))
plot(xs,ys, col=col, xlab="x", ylab="y")

Hope that helps

Henrik Bengtsson
> -----Original Message-----
> From: r-help-admin at stat.math.ethz.ch 
> [mailto:r-help-admin at stat.math.ethz.ch] On Behalf Of Hi from Zynnel
> Sent: den 26 februari 2003 17:41
> To: r-help at stat.math.ethz.ch
> Subject: [R] multiple plot overlay - dataframe
> 
> 
> I hope you could help me with this. I have a dataframe
> with 5 columns, the first column determining the X
> values, and the rest four determining four separate Y
> vectors. How can I plot them on the same graph,
> overlaying each other?
> Thanks.
> 
> Elena Zheleva
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list 
> http://www.stat.math.ethz.ch/mailman/listinfo/> r-help
> 
>

Hi

On 25 Feb 2003 at 22:41, Hi from Zynnel wrote:
> I hope you could help me with this. I have a dataframe
> with 5 columns, the first column determining the X
> values, and the rest four determining four separate Y
> vectors. How can I plot them on the same graph,
> overlaying each other?
It depends little bit on range of your Y values. If it is similar magnitude,
then
simple

matplot(your.df[,1],your.df[,3:6],type="l")

see
?matplot

will do it. But if the range of your Y values is big you have to do some 
"flattening" or to use subsequent plot commands with par(new=T).

See
?plot and ?par
> Thanks.
> 
> Elena Zheleva
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> http://www.stat.math.ethz.ch/mailman/listinfo/r-help
Cheers.Petr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz

>I hope you could help me with this. I have a dataframe
>with 5 columns, the first column determining the X
>values, and the rest four determining four separate Y
>vectors. How can I plot them on the same graph,
>overlaying each other?
Use matplot() to plot several plots in the same window.

help(matplot) for more info.

Regards
Jose Lozano