OK that's it. Working nicely. I sent the final graph with the note of the
twoord.plot help attached to it. And some "personal" comments
Thank you very much for all the help and remarks.

Rodrigo.

2010/12/10 Dennis Murphy <djmuser@gmail.com>

> Hi:
>
> Like Peter Ehlers, I'm not a big fan of multiple response variables on a
> page with different y-axis scaling, but if you have to do it, try not to let
> one graphical metaphor interfere with/obscure/dominate the other (e.g., bars
> and lines). This is my attempt, both with connecting lines and points, but
> am holding my nose in the process:
>
> library(plotrix)
> dd <- read.table(textConnection("
>
> Point   Rain    Salt
> Fev/03  365.6   13
> Mar/03  235     18
> Abr/03  115.1   18
> Mai/03  47.4    18.75
> Jun/03  112     15
> Jul/03  156.8   17
> Ago/03  66.1    15
> Set/03  149.8   14
> Out/03  167.1   11.5
> Nov/03  269.3   17.5
> Dez/03  283.7   NA
>
> Jan/04  415     1.3
> Fev/04  322     8.5
> Mar/04  258.7   10.5"), header = TRUE, stringsAsFactors = FALSE)
> closeAllConnections()
>
> dd$mo <- seq(nrow(dd))
>
> with(dd,
>   twoord.plot(lx = mo, ly = Rain, rx = mo, ry = Salt,
>               lylim = c(0, 450), rylim = c(0, 20),
>               lcol = 'red', rcol = 'blue',
>               lpch = 1, rpch = 16, type = c('b', 'b'),
>               xtickpos = mo, xticklab = Point)
>     )
> legend('bottomleft', leg = c('Rain (left axis)', 'Salt (right axis)'),
>          text.col = c('red', 'blue'), col = c('red', 'blue'), lty = c(1, 1)
> )
>
> I understand why these types of plots exist in general, and I can see why
> you might want to compare two variables that are temporally related but have
> different units of measurement, but by doing so, you are increasing the
> cognitive task of the average viewer. As Greg Snow mentioned, read the
> section of ?twoord,plot headlined 'Note' and observe that this plot has
> crossing profiles (points connected by lines).  And remember that it's your
> responsibility to properly convey the message of the plot to the viewer...
>
> HTH,
> Dennis
>
> On Thu, Dec 9, 2010 at 2:22 PM, Rodrigo Aluizio <r.aluizio@gmail.com>wrote:
>
>> Oh sorry. An example say lots more than words. The data below, when
>> submitted to twoord.plot return the mentioned error. Rain are bars and
>> Salt
>> lines, the bars appear and the error occurs with the salt data.
>>
>> Point   Rain    Salt
>> Fev/03  365.6   13
>> Mar/03  235     18
>> Abr/03  115.1   18
>> Mai/03  47.4    18.75
>> Jun/03  112     15
>> Jul/03  156.8   17
>> Ago/03  66.1    15
>> Set/03  149.8   14
>> Out/03  167,1   11.5
>> Nov/03  269.3   17.5
>> Dez/03  283.7
>> Jan/04  415     1,3
>> Fev/04  322     8,5
>> Mar/04  258.7   10.5
>>
>> -----Mensagem original-----
>> De: Greg Snow [mailto:Greg.Snow@imail.org]
>> Enviada em: quinta-feira, 9 de dezembro de 2010 17:57
>> Para: Rodrigo Aluizio; 'R Help'
>> Assunto: RE: [R] Barplot with "Independent" Lines Y axis
>>
>> Without seeing a reproducible example we cannot be sure, but my guess is
>> that you are letting twoord.plot set the limits and the function does not
>> remove missing values, if you specify rylim and or lylim arguments
>> specifically, then it should not run into the problem you are seeing (I
>> hope).
>>
>> If that does not work, then send a small reproducible example (the dput
>> command is great for the data part) which will help us find the problem.
>>
>> --
>> Gregory (Greg) L. Snow Ph.D.
>> Statistical Data Center
>> Intermountain Healthcare
>> greg.snow@imail.org
>> 801.408.8111
>>
>>
>> > -----Original Message-----
>> > From: Rodrigo Aluizio [mailto:r.aluizio@gmail.com]
>> > Sent: Thursday, December 09, 2010 12:27 PM
>> > To: Greg Snow; 'R Help'
>> > Subject: RES: [R] Barplot with "Independent" Lines Y axis
>> >
>> > Thank you for the function suggestion, works nicely for complete data
>> > vectors. Just another question. When using the twoord.plot I reached
>> > another
>> > issue, it seems that this function can't handle NAs in one of the
>> > variables
>> > (the data of one month for another variable is missing). The lines and
>> > barplot functions just interrupt the plot and continue after the NA but
>> > twoord.plot gives me an error: Error at plot.window(...) : finite
>> > values are
>> > necessary for 'ylim'
>> >
>> > Is there a way to work around this error?
>> >
>> > P.S.: I'm aware of the problems regarding this type of graph, but this
>> > time
>> > it's not a choice of mine (unfortunately). Thank you anyway for the
>> > highlight, maybe it will help me arguing.
>> >
>> > Regards
>> >
>> > Rodrigo.
>> >
>> > -----Mensagem original-----
>> > De: Greg Snow [mailto:Greg.Snow@imail.org]
>> > Enviada em: quinta-feira, 9 de dezembro de 2010 15:56
>> > Para: Rodrigo Aluizio; R Help
>> > Assunto: RE: [R] Barplot with "Independent" Lines Y axis
>> >
>> > Look at the twoord.plot function in the plotrix package, but be sure to
>> > read
>> > the note on the help page, then reread it and take its advice if you
>> > decide
>> > to stick with this type of plot.
>> >
>> > --
>> > Gregory (Greg) L. Snow Ph.D.
>> > Statistical Data Center
>> > Intermountain Healthcare
>> > greg.snow@imail.org
>> > 801.408.8111
>> >
>> >
>> > > -----Original Message-----
>> > > From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-
>> > > project.org] On Behalf Of Rodrigo Aluizio
>> > > Sent: Thursday, December 09, 2010 9:44 AM
>> > > To: R Help
>> > > Subject: [R] Barplot with "Independent" Lines Y axis
>> > >
>> > > Hi list. I'm plotting pluviometric (Rain) data as a barplot, and then
>> > > adding
>> > > the salinity variable to this plot as lines. Obviously as these Y
>> > > scales are
>> > > completely different the salinity appears at the lower part of the
>> > > graph
>> > > extremely compacted. I need to plot the line at the exactly same area
>> > > of the
>> > > barplot but with its own Y axis (at the right), so the salinity can
>> > use
>> > > the
>> > > plot area freely. I tried the par(new=T), but it only works for high
>> > > level
>> > > plot functions (not for lines or points).
>> > >
>> > > Below are some example data and the code I'm using:
>> > >
>> > > Month       Rain    Salt
>> > > Fev 365.6   13
>> > > Mar 235     18
>> > > Abr 115.1   18
>> > > Mai 47.4    18.75
>> > > Jun 112     15
>> > > Jul 156.8   17
>> > > Ago 66.1    15
>> > > Set 149.8   14
>> > > Out 167.1   11.5
>> > > Nov 269.3   17.5
>> > >
>> > > mp<-barplot(Dados$Rain,names.arg=rownames(Dados),ylab='Pluviosidade
>> > > (mm)',width=0.5,ylim=c(0,370),yaxp=c(0,370,10))
>> > > lines(mp,Dados$Salt,type='b',pch=19,lty='dotted')
>> > >
>> > > Any ideas?
>> > >
>> > > Thank you for the attention.
>> > >
>> > > Regards
>> > >
>> > > -------------------------------------------------------------------
>> > > MSc. Rodrigo Aluizio
>> > > Centro de Estudos do Mar/UFPR
>> > >
>> > > ______________________________________________
>> > > 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.
>>
>> ______________________________________________
>> 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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