On Oct 19, 2007, at 10:54 AM, John Sorkin wrote:
> Windows XP
> R 2.5.0
> I am trying to produce two plots that have the same range, i.e. x
> from 50 to 400 on both plots and y from 50 to 400 on both plots.
> (This will allow me to compare slopes). I have used the code below
> without success using usr (I have also used xaxp and yaxp but I am
> not including the code):
>
> plot(tgNo26[,"TGh"],tgNo26[,"TGs"],usr=c(50,400,50,400))
> plot(tgNo26[grep("CONTROL",tgNo26[,"PATIENT"]),"TGh"],
> tgNo26[grep("CONTROL",tgNo26[,"PATIENT"]),"TGs"],usr=c
> (50,400,50,400))
>
> RESULT:
> axes on first plot 50-400, y axis 50-350
> axes on second plot 50-250 y axis 100-250
From
?plot.default
Are you looking for:
xlim the x limits (x1, x2) of the plot. Note that x1 > x2 is allowed
and leads to a “reversed axis”.
ylim the y limits of the plot.
I believe this will allow you to set the axes to the same limits so
that you can compare more easily.
HTH
James
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