[R] filed plot symbols
Dermot MacSweeney
dsweeney at nmrc.ucc.ie
Tue Oct 17 17:13:51 CEST 2000
As a follow on to Bill's question, if we look at the example which he gives, the
legend will have lines going through the empty symbols. If there any way to
prevent this aside from the obvious (only use filled symbols in graphs).
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Date: Tue, 17 Oct 2000 10:57:36 +0100 (BST)
From: Bill Simpson <wsi at gcal.ac.uk>
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Subject: [R] filed plot symbols
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This example,
x<-1:10
y1<-x
y2<-x+2
plot(x,y1,pch=21,ylim=range(c(y1,y2)),type="o",lty="solid",bg="white")
points(x,y2,pch=22,type="o",lty="dashed",bg="white")
legend(7,3,legend=c("y1","y2"),pch=c(21,22),lty=c("solid","dashed"),bg="white")
works if I use pch = one of 21-25. But if I use pch= one of 0-6, it
doesn't work: the line goes through the empty symbols (instead of
the symbols appearing solid).
I was just curious why this is set up this way. Symbols 21-25 just seem to
repeat some others (e.g. 21 and 1 are both circles), except that the early
ones are not fillable with the bg="white" trick. I wonder why not just
remove the existing symbols 1-6 and replace them with the 21-25
counterparts. (There probably is a good reason why it is set as it is)
Bill
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Dermot MacSweeney NMRC,
Email: dsweeney at nmrc.ucc.ie Lee Maltings,
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