[R] Mirror Image on Biplot Graphic

[Mark Difford]

Hi Rodrigo,

>> I need to rotate on y axis the lines and symbols of constrained and sites
>> representation.

Easiest is to multiply the axis you want to invert by -1. Something like the
following, where my.cca is the orginal object and yax = obj[, 2] (xax being
obj[, 1]). Obviously, copying isn't necessary.

mynew.cca <- my.cca
mynew.cca$scores$species[, 2] <- my.cca$scores$species[, 2] * -1
mynew.cca$scores$sites[, 2] <- my.cca$scores$sites[, 2] * -1
mynew.cca$scores$centroids[, 2] <- my.cca$scores$centroids[, 2] * -1

Regards, Mark.


Rodrigo Aluizio wrote:
> 
> He everybody,
> Well I have a biplot CCA-like origined from plot.cca (vegan package). I
> need to rotate on y axis the lines and symbols of constrained and sites
> representation. If I do that on an image editor, I rotate everything,
> including titles, axes labels and positions. I just need to rotate the
> inner par and keep the variables names (constrained) and symbols in the
> new positions but with the right direction.
> So, is there on R a way to do that while creating the image?
> Here is the code that generate the graphic.
> 
> plot.cca(CAPpotiFT,type='none',display=c('bp','sites'),main='Total Fauna
> Sites x Environment')
> text.cca(CAPpotiFT,dis='cn',col='black',cex=0.6,lwd=0.5,lty='dotted')
> points(ScoresCAPFT$sites[FatoresRep$BiofaciesBC=='1',],pch=21)
> points(ScoresCAPFT$sites[FatoresRep$BiofaciesBC=='2',],pch=20)
> points(ScoresCAPFT$sites[FatoresRep$BiofaciesBC=='3',],pch=22,bg='gray')
> points(ScoresCAPFT$sites[FatoresRep$BiofaciesBC=='4',],pch=24)
> points(ScoresCAPFT$sites[FatoresRep$BiofaciesBC=='5',],pch=24,bg='black')
> points(ScoresCAPFT$sites[FatoresRep$BiofaciesBC=='6',],pch=25,bg='gray')
> 
> Thanks in advice.
> ___________________________________
> MSc. Rodrigo Aluizio
> Centro de Estudos do Mar/UFPR
> Laboratório de Micropaleontologia
> 
> 	[[alternative HTML version deleted]]
> 
> 
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