How can I make a point that is a big, NOT colored in circle?
x0 and y0 are just lists with 1 value.
So this just plots one value:
points(x=x0,y=y0,col="green",pch=16)
But the circle is sort of small, and it's colored in.
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possible duplicate of Control the size of points in an R scatterplot?Ari B. Friedman– Ari B. Friedman2011-08-20 18:50:55 +00:00Commented Aug 20, 2011 at 18:50
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3 Answers
To make the single plotting character larger, use cex, as in:
points(x = x0, y = y0, col = "green", pch = 16, cex = 10)
Please read (even though it's kind of tedious) ?par for base graphics options.
EDIT
I suppose I should add (even though I agree this question is mostly a duplicate) that the second part of your question simply requires a different value for pch. Sounds like pch = 1 is what you want, but you can see lots of options via example("points").
Comments
Depending how big you the circles you want, you could also consider the symbols() function.
## from ?symbols
N <- nrow(trees)
with(trees, {
## Girth is diameter in inches
symbols(Height, Volume, circles = Girth/24, inches = FALSE,
main = "Trees' Girth") # xlab and ylab automatically
})
Comments
The package shape contains a collection of functions for plotting all kind of graphical shapes ( see vignette("shape") ). In your case:
install.packages("shape")
require("shape")
emptyplot(c(0, 1))
plotcircle(mid = c(0.5, 0.5), r = 0.25)
