Hi Christy,
you could use the function fixLMmirror() embedded in the Morpho R package.
Here an example:
library(Morpho)
?fixLMmirror
#create dataset
mat<-matrix(NA,ncol=2,nrow=10)
#first 4 landmarks along the midplane
mat[1:4,]<-rbind(c(3.01,2),c(3.0,2.1),c(2.99,2.3),c(2.99,2.5))
#three landmarks on the left side
mat[5:7,]<-rbind(c(2,2),c(2.5,3),c(2.5,1.5))
#three missing landmarks on the right side
plot(NA,xlim=c(1,6),ylim=c(1,4))
points(mat)
#define left landmarks
left<-c(5:7)
#define right landmarks
right<-c(8:10)
pairedLM<-cbind(left,right)
#in this case, the missing landmarks are 8, 9, 10
onesidefixed <- fixLMmirror(mat,pairedLM)
points(onesidefixed[right,],col="red")
Best,
Antonio
2018-08-24 6:31 GMT+02:00 Christy Hipsley :
> Dear all,
>
> I'm working with a 2D landmark data set of vertebrae in anterior view in
> which one side (right) has been landmarked, with 5 landmarks along the
> midplane axis for a total of 12 points.
>
> I would like to generate a mirror reflection of the paired landmarks, and
> wonder if there is an easy way to do this. I naively tried multiplying the
> x coordinate dimensions *-1 and keeping y the same, but since the midplane
> x coordinates are not at 0 this obviously doesn't work.
>
> Any advice or code would be greatly appreciated!
>
> Thanks,
> Christy
>
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Antonio Profico
PhD
Department of Environmental Biology – Dipartimento di Biologia Ambientale
SAPIENZA Università di Roma
Lab. 06 4991 2690
Mob. 3293440766
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