[R] Barplot with "Independent" Lines Y axis

[Greg Snow]

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 at imail.org
801.408.8111


> -----Original Message-----
> From: Rodrigo Aluizio [mailto:r.aluizio at 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 at 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 at imail.org
> 801.408.8111
> 
> 
> > -----Original Message-----
> > From: r-help-bounces at r-project.org [mailto:r-help-bounces at 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
> >
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> > and provide commented, minimal, self-contained, reproducible code.