annotate error: Discrete value supplied to continuous scale

[bdmccu...@drexel.edu]

All I want to do is put the word "alpha" at the position (-2.5, 0.2) on this graph, and I can't figure out what is causing the error.

library(ggplot2)
myx <- seq(-4,4,0.01)
myy <- dnorm(myx)
df <- as.data.frame(cbind(myx,myy))
ggplot(df,aes(myx,myy)) +  geom_point() + annotate("text",x=-2.5,y=0.2,"alpha")

All I get is:
Error: Discrete value supplied to continuous scale


I have found many complex discussions of this particular error message, but none related to so simple a case as mine, and none relating to annotate.

Many thanks for any help.

[Tom Philippi]

annotate() has a bunch of other parameters you are omitting, so you need to tell it which parameter "alpha" is a value for:

ggplot(df,aes(myx,myy)) +  geom_point() + annotate("text",x=-2.5,y=0.2,label="alpha")

?annotate

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