in R, my x-axis label does not appear and how to add it?

Question

As you can see in the attached graph I plotted, the labels on X-Axis are missing. I checked some methods and can not figure out how to add the labels. Actually, I want to add the labels of $500,$1000,$2000,$5000,$10000,$20000 on X-Axis. Could you give advice on this? (Please note my labels are not equally distancing) Below is part of codes FYI:

gg3 <- gg2 +
  theme(legend.position="top",legend.direction = "horizontal") +
  guides(size = FALSE) +
  theme(legend.title = element_blank())

gg4 <- gg3 +
  scale_x_discrete(breaks=c("500","1000","2000","5000","10000","20000"))

Thank you!

Answer 1

A sample of your data would help here. However you may want to try this:

gg4 <- gg3 +
  scale_x_continuous(breaks = c(500, 1000, 2000, 5000, 10000, 20000),
                     labels = function(breaks) paste0("$", breaks))