Dear Rajesh,
A quick reply to your questions concerning the diagram package
 
 
To use different colors per arrow : just define arr.col as a
matrix or a data.frame, and give the color number or name to each arrow:
 
To use numbers:
  M <- matrix(nrow=4,ncol=4,data=0)
  M[2,1]<-1  ;M[4,2]<-2;M[3,4]<-3;M[1,3]<-4
  pp<-plotmat(M,pos=c(1,2,1),curve=0.2,name=letters[1:4],lwd=1,box.lwd=2,
              cex.txt=0.8,arr.type="triangle",box.size=0.1,box.type="rect",
              box.prop=0.5,arr.len=0.6,arr.col=M)
 
To use color names:
  arr.col <- as.data.frame(M)
  arr.col[2,1]<-"red"
  arr.col[4,2]<-"black"
  arr.col[3,4]<-"darkgreen"
  arr.col[1,3]<-"orange"
   pp<-plotmat(M,pos=c(1,2,1),curve=0.2,name=letters[1:4],lwd=1,box.lwd=2,
              cex.txt=0.8,arr.type="triangle",box.size=0.1,box.type="rect",
              box.prop=0.5, arr.len=0.8,arr.col=arr.col)

 
Karline

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