Change arrowhead of arrows()

Question

i wonder if it is possible to change the arrowhead of an arrow drawn with arrows(). I looked through the documentation but all I found is that I can change the end of a line but not of an arrow?

plot(c(1:10)) arrows(0,0,10,10) 

Any help is appreciated :)

Answer 1

as explained in ?arrow , you can use length and angle to change the appearance of standard arrows. With lwd you can change the thickness, exactly like in lines(). Also lty works, although the result is often not exactly nice.

A whole set of examples :

plot(c(0:10),type="n")  arrows(1,0,2,1,length=0.2,angle=20) arrows(1,1,2,2,length=0.1,angle=40,lwd=3)  invisible(mapply(arrows,         rep(c(3,6),each=4),rep(3:6,2),         rep(c(5,8),each=4),rep(5:8,2),         angle=seq(10,40,length.out=8),         length=rep(seq(0.1,0.3,length.out=4),2),         lwd=rep(1:4,each=2)) ) 

Answer 2

Karline Soetaert's package shape is useful for this purpose:

library(shape) plot(c(0,2),c(-2,2), col=NA) Arrows(c(0,1.7),c(1.3,-1.8),c(0.8,1.1),c(1.2,-1), lwd=2) 

The default is a filled, curved arrowhead that's pleasant to look at:

Gotta love CRAN!