[R] wrong labels and colors of points in graph/plot

katharina may.katharina at googlemail.com
Thu Jun 4 18:54:37 CEST 2009


sorry, the attachment can be found here for download:
http://www.wzw.tum.de/waldinventur/fileadmin/coefficient2.RData



katharina wrote:
> 
> Hi there,
> 
> I trying to solve this problem for the whole day not going anywhere,
> so I  really hope maybe somebody can help
> me in this community...
> I've got an object coefficient2 which I want to plot in differerent
> ways, with colors and labels added to the points,
> but somehow there seems to be a problem if a value is NA within the
> independent variable, resulting in false labels and false colors for
> the points.
> 
> plot(coefficient2$intercept ~ coefficient2$average_height,
> main="intercepts ::: height", ylab="intercepts", xlab="average height
> per site [cm]", xlim=c(20,3020), ylim=c(-2,5), col=coefficient2$color)
> highlight(coefficient2$intercept ~ coefficient2$average_height,
> lbls=coefficient2$site_no,col="Red", cex = .6)
> 
> plot(coefficient2$intercept ~ coefficient2$average_dbh,
> main="intercepts ::: dbh", ylab="intercepts", xlab="average dbh per
> site [mm]", xlim=c(-10,360), ylim=c(-2,5),col=coefficient2$color )
> highlight(coefficient2$intercept ~ coefficient2$average_dbh,
> lbls=coefficient2$site_no,col="Red", cex = .6
> 
> 
> If I create a temporary object for each plot excluding any NA values
> for the x axis variable, somehow all points are displayed and the
> labels are correct except for the color (I have e.g. no clue why some
> points are red which I do not define at all and no ones are yellow
> which I use several times).
> 
> #create temp container for all coefficients with average heights for
> plotting
> coef_avheight <- coefficient2[which(!is.na(coefficient2$average_height)),]
> plot(coef_avheight$intercept ~ coef_avheight$average_height,
> main="intercepts ::: height", ylab="intercepts", xlab="average height
> per site [cm]", xlim=c(20,3020), ylim=c(-2,5),
> col=coef_avheight$color)
> highlight(coef_avheight$intercept ~ coef_avheight$average_height,
> lbls=coef_avheight$site_no,col="Red", cex = .6)
> 
> #create temp container for all coefficients with average dbh for plotting
> coef_avdbh<- coefficient2[which(!is.na(coefficient2$average_dbh)),]
> plot(coef_avdbh$intercept ~ coef_avdbh$average_dbh,  main="intercepts
> ::: dbh", ylab="intercepts", xlab="average dbh per site [mm]",
> xlim=c(-10,360), ylim=c(-2,5),col=coef_avdbh$color )
> highlight(coef_avdbh$intercept ~ coef_avdbh$average_dbh,
> lbls=coef_avdbh$site_no,col="Red", cex = .6)
> 
> 
> Maybe someone can explain me the color issue and the problem with the
> NA values which results in a wrong labeling and to few
> points being displayed? I'm new to R as you can guess and my code
> isn't really elegant but I really cannot get faults within it...
> 
> 
> Attached you can find the referred R object (coefficient2).
> highlight requires library(NCStats)...
> 
> Thank you very, very much,
> 
>                        Katharina
> 
> ______________________________________________
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> 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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