What does size really mean in geom_point?

Posted by Jonas Stein on Stack Overflow See other posts from Stack Overflow or by Jonas Stein
Published on 2012-11-25T04:35:40Z Indexed on 2012/11/25 5:03 UTC
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In both plots the points look different, but why?

mya <- data.frame(a=1:100)

ggplot() +
  geom_path(data=mya, aes(x=a, y=a, colour=2, size=seq(0.1,10,0.1))) +
  geom_point(data=mya, aes(x=a, y=a, colour=1, size=1)) +
  theme_bw() +
  theme(text=element_text(size=11))

ggplot() +
  geom_path(data=mya, aes(x=a, y=a, colour=2, size=1)) +
  geom_point(data=mya, aes(x=a, y=a, colour=1, size=1)) +
  theme_bw() +
  theme(text=element_text(size=11))

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