Hello i am new to ggplot and i observed a strange behavior.
I want to display two groups of points, each group with a different color.
But i encountered a problem with the colors.
Here is a first example:
dataset <- data.frame(Main = c("A", "A", "B", "B"), Detail = c( "b", "c", "1",
"2"), resp = runif(4, min = 0.5, max = 1))
ggplot(dataset, aes(x = Detail, y = resp)) +
facet_grid(.~Main, scales = "free_x")+ geom_point(aes( size=6,shape =
c(16,16,15,15) ),colour="blue")+geom_hline(aes(yintercept=0.25),colour='blue',
size=2)
with this code all the point are blue (like the line below)
But if i try the following code, where my goal is to have the point on the left
blue and the one on the right red, a problem appears:
dataset <- data.frame(Main = c("A", "A", "B", "B"), Detail = c( "b", "c", "1",
"2"), resp = runif(4, min = 0.5, max = 1))
ggplot(dataset, aes(x = Detail, y = resp)) +
facet_grid(.~Main, scales = "free_x")+ geom_point(aes( size=6,shape =
c(16,16,15,15)
,colour=c("blue","blue","red","red")))+geom_hline(aes(yintercept=0.25),colour='blue',
size=2)
The points have different colors but those colors are pale (dull). You can see
it by comparing the blue of the points to the blue of the line.
I guessing i am duing it wrong but i'm stucked with it.
Do you have suggestions?
An additional question is that i want to add text along the blue line (which is
a reference) but i did not understand what geom_text was expecting.
Thanks for your help!
Victor
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