[R] Graph is without line

[PIKAL Petr]

Hi

It is mostly question of personal preference. Factors have some nice features when manipulating with levels, sorting, and/or using numeric annotation. However when you want to add some new value to factor it is trickier than with plain string vectors. Maybe it is time to look into R-intro explanation of object differences. 

Petr

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of mohan.radhakrishnan at polarisft.com
> Sent: Wednesday, September 25, 2013 6:13 AM
> To: Jim Lemon
> Cc: r-help at r-project.org
> Subject: Re: [R] Graph is without line
> 
> Hi,
>              Yes. It worked. Is 'stringAsFactors=FALSE' the switch to
> use when reading data into a frame ? All the values I use are either
> numbers or dates or strings. Sometimes while I manipulate the data by
> filtering, the values seem to become factors ?
> 
> Thanks,
> Mohan
> 
> 
> 
> From:   Jim Lemon <jim at bitwrit.com.au>
> To:     mohan.radhakrishnan at polarisft.com
> Cc:     r-help at r-project.org
> Date:   09/25/2013 05:56 AM
> Subject:        Re: [R] Graph is without line
> 
> 
> 
> On 09/24/2013 10:46 PM, mohan.radhakrishnan at polarisft.com wrote:
> > Hi,
> >          Sometimes I get a graph like the attached one. The data type
> could
> > have something to do with it. This graph does not use the color and
> > does not draw a line. Earlier I used to convert the factors in the
> > data frame to
> another
> > data type and drew the correct graphs.
> >
> > Any idea why this happens ?
> >
> > Thanks,
> > Mohan
> >
> >              Var1 Freq
> > 1     10.1.17.10  205
> > 2     10.1.17.15  216
> > 3     10.1.17.17   79
> > 4     10.1.17.23   76
> > 5     10.1.17.24  209
> > 6      10.1.17.5  244
> > 7      10.1.17.6  178
> > 8      10.1.17.7  165
> > 9      10.1.17.8  146
> >
> >
> >
> > #prints factor
> > print(class(data$Var1))
> >
> >
> plot(data$Var1,data$Freq,ylim=c(0,700),col="green",type="o",ylab="",xla
> b="",las=2,lwd=2.5,xaxt="n")
> > title("Estimation of concurrent connections",cex.main=3)
> > library(plotrix)
> > staxlab(at=data$Var1,
> >    labels=as.character(data$Var1),nlines=3,srt=90)
> >
> Hi Mohan,
> If you pass a factor as the "x" value to plot, it assumes that the
> values of the factor are nominal or at best ordinal and does not try to
> connect them into a metric scale. You can get a "line" with:
> 
> plot(as.numeric(data$Var1),data$Freq,ylim=c(0,700),col="green",type="o"
> ,
>   ylab="",xlab="",las=2,lwd=2.5,xaxt="n")
> ...
> 
> but think carefully about whether this means anything sensible.
> 
> Jim
> 
> 
> 
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