replace the x axis with specific words

[ccw9...@gmail.com]

Hi everyone,

I have a plot, while I wanna change the 3 groups in the x axis (1,2,3) in to some specific words, number 1 for B_a, 2 for A_a, 3 for C_a. while the a should be the subscript. I dont know how to do that ,thanks so much.

[Dennis Murphy]

Here's an example to generate mathematical labels - ignore the warning.

DF <- data.frame(x = factor(LETTERS[1:3]), y = c(20, 30, 10))

library(ggplot2)

# See ?plotmath for explanation

lbls <- c(expression(A[a]), expression(B[a]), expression(C[a]))

ggplot(DF, aes(x = x, y = y)) +

   geom_bar(stat = "identity", fill = "darkorange") +

   scale_x_discrete(labels = lbls)

The key point is that the labels should be put in a vector of expressions.

Dynamite plots? Sigh....

Dennis

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[Hadley Wickham]

One tiny point: an expression() is a vectorised data structure, so you can just do:

lbls <- expression(A[a], B[a], C[a])

Hadley

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[Dennis Murphy]

I wondered about that but didn't follow through. I forgot that expression() was vectorized. Thanks, Hadley.

Dennis