I've missed William's e-mail indeed, I've tested it and works great, thanks a 
lot!!!

Many Thanks
Guido
________________________________________
From: Matthieu Stigler [matthieu.stig...@gmail.com]
Sent: 20 April 2011 09:30
To: Barbaglia, Guido (ESA)
Cc: wdun...@tibco.com; r-help@r-project.org
Subject: Re: [R] Axes Alignment Problem for Multiple Plots

Guido

You missed William's e-mails, which solved the problem:
use

  yaxs="i"


in second call. Also, William made the good point that you can rather
just use lines() in second call.

Good William!

Mat



Le 20/04/2011 08:00, Barbaglia, Guido (ESA) a écrit :
> Dear Matthieu,
>
>     thanks for your clarification! Basically, what I need to do is to plot 
> different series on the same chart using different types of plot (lines, 
> barplot, ...) and it is fundamental that the various charts have the same 
> reference system. I hope that someone in the list is able to fix my problem!
>
>
> Best Regards
> Guido Barbaglia
>
> ________________________________________
> From: mat [matthieu.stig...@gmail.com]
> Sent: 19 April 2011 22:58
> To: John Kane
> Cc: r-help@r-project.org; Barbaglia, Guido (ESA)
> Subject: Re: [R] Axes Alignment Problem for Multiple Plots
>
> Ok, I can replicate your problem, with following code:
>
> dat<- 1:10
>      barplot(dat, beside=TRUE,ylim=c(0,100));
>      par()$usr;
>      par(new=T);
>      plot(dat, ylim=c(0,100), type="l");
>      par()$usr;
>
> So it looks like even if you specify yourself ylim, the resulting
> effective ylim (usr[3:4] ) will be different! More surprinsingly,
> setting the usr parameter before is not effective:
>      par(new=T, usr=c(0,11,0,100));
>
> this will not prevent    par()$usr; to be different than fixed :-(
>
> No idea, but hopefully someone else on the list will be able to provide
> advice!
>
> Matthieu
>
>
>
>
> Le 19. 04. 11 20:47, John Kane a écrit :
>> What is Coredata(Z0)?
>> It would be very useful. as the posting guidelines suggest to supply working 
>> code and sample data.
>>
>>
>> --- On Tue, 4/19/11, Barbaglia, Guido (ESA)<guido.barbag...@fao.org>   wrote:
>>
>>> From: Barbaglia, Guido (ESA)<guido.barbag...@fao.org>
>>> Subject: [R] Axes Alignment Problem for Multiple Plots
>>> To: "r-help@r-project.org"<r-help@r-project.org>
>>> Cc: "Stigler, Matthieu (EST)"<matthieu.stig...@fao.org>
>>> Received: Tuesday, April 19, 2011, 11:42 AM
>>> Dear all,
>>>
>>>      I'm trying to plot, in the same window,
>>> two different series, using barplot() for the first one and
>>> plot() for the second. What happens is that the second chart
>>> has a different axes origin, therefore the final plot is
>>> wrong. This piece of code shows the differences between the
>>> values of par()$usr:
>>>
>>>      barplot(coredata(Z0), beside=TRUE,
>>> ylim=c(0,100));
>>>      par()$usr;
>>>      par(new=T);
>>>      plot(coredata(Z0), ylim=c(0,100));
>>>      par()$usr;
>>>
>>> I would like to know how it is possible to edit the values
>>> of par()$usr[3:4] of the second chart in order to be the
>>> same of the first one or, alternatively, how can I plot
>>> together bar and line series within the same reference
>>> system.
>>>
>>>
>>> Best Regards
>>> Guido Barbaglia
>>> ______________________________________________
>>> R-help@r-project.org
>>> mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained,
>>> reproducible code.
>>>

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