R help - Dec 2010 - 2 plots with different scales in the same graphical window

Dear useRs,
I have two sets of data that I would like to plot in the same window, but their 
ranges are really different, e.g.

a <- c(0.2, 0.5, 0.8, 0.3, 0.4, 0.5, 0.2, 0.2, 0.3)
b <- c(100, 2000, 800, 200, 100, 50, 4, 2, 0)

If I do
plot(a, ty='l'); points(b, ty='l')
I won't be able to see sequence b.

However, if I do
plot(b, ty='l'); points(a, ty='l')
I won't be able to see the patterns in sequence a.

So is  there a way of plotting sequence a and b without applying log or 
anything, but sequence a would be correspondent to the left y-axis and sequence 
b correspondent to the right y-axis?

Thanks in advance,
Best,
Rafael.


      
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Hi

r-help-bounces at r-project.org napsal dne 09.12.2010 16:25:06:
> Dear useRs,
> I have two sets of data that I would like to plot in the same window, 
but their 
> ranges are really different, e.g.
> 
> a <- c(0.2, 0.5, 0.8, 0.3, 0.4, 0.5, 0.2, 0.2, 0.3)
> b <- c(100, 2000, 800, 200, 100, 50, 4, 2, 0)
> 
> If I do
> plot(a, ty='l'); points(b, ty='l')
> I won't be able to see sequence b.
> 
> However, if I do
> plot(b, ty='l'); points(a, ty='l')
> I won't be able to see the patterns in sequence a.
> 
> So is  there a way of plotting sequence a and b without applying log or 
> anything, but sequence a would be correspondent to the left y-axis and 
sequence 
> b correspondent to the right y-axis?
See twoord.plot from plotrix.

Or search archuves for a function plot.yy (I posted it few years ago).

Regards
Petr

> 
> Thanks in advance,
> Best,
> Rafael.
> 
> 
> 
>    [[alternative HTML version deleted]]
> 
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