[R] gap.barplot doesn't support data arrays?

[Andrew D. Steen]

True - gapped stacked bar plots make no sense at all.  I'm working my way up
to a gapped bar plot with series next to each other (and error bars!), what
you'd get if you put a gap in the y-axis of 

> twogrp2<-array(twogrp, dim=c(2,5))
> barplot(twogrp2, beside=TRUE)

I'm guessing I can do this if I spend enough time with the axis.break()
function.  But is there an easier way?

--Drew

> -----Original Message-----
> From: Peter Ehlers [mailto:ehlers at ucalgary.ca]
> Sent: Monday, April 04, 2011 4:33 PM
> To: Andrew D. Steen
> Cc: r-help at r-project.org
> Subject: Re: [R] gap.barplot doesn't support data arrays?
> 
> On 2011-04-04 06:39, Andrew D. Steen wrote:
> > I am trying to make a barplot with a broken axis using gap.barplot
> (in the
> > indispensable plotrix package).  This works well when the data is a
> vector:
> >
> >> twogrp<-c(rnorm(10)+4,rnorm(10)+20)
> >>
> gap.barplot(twogrp,gap=c(8,16),xlab="Index",ytics=c(3,6,17,20),ylab="Gr
> oup
> > values",main="Barplot with gap")
> >
> > But when the data is an array (for a bar plot with multiple series) I
> get an
> > error and a strange plot with no y-tics and bars stretching
> downwards, as if
> > all the values were negative:
> >
> >> twogrp2<-array(twogrp, dim=c(2,5))
> >>
> >
> gap.barplot(twogrp2,gap=c(8,16),xlab="Index",ytics=c(3,6,17,20),ylab="G
> roup
> > values",main="Barplot with gap")
> >
> > Error in rect(xtics[bigones] - halfwidth, botgap, xtics[bigones] +
> > halfwidth,  :
> >    cannot mix zero-length and non-zero-length coordinates
> >
> > However, the main title and axis labels do appear correctly.
> >
> > Are data arrays unsupported for gap.barplot, or am I missing
> something?
> 
> Looks like they're not supported, as you could easily see from
> the code. But do gapped stacked barplots even make sense? Not
> to me.
> 
> Still, I think that the plotrix documentation is somewhat
> spotty. The help page for gap.barplot indicates that the
> input 'y' should be 'data values'; not overly informative.
> 
> Peter Ehlers
> 
> >
> > Thanks,
> > Drew Steen
> >
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