ggplot2 plot question in R

Question

I created a ggplot2 plot where I struggle with 2 things.

1) How to change the colors?

2) Why is the line missing between items 9 and 10?

cent <- rnorm(n=20, mean=5, sd=1)
num <- c(1:20)
groups2 <- c(rep("DSM Symptoms",9),rep("Non-DSM Symptoms",11))
data2 <- data.frame(num, cent, groups2)

ggplot(data2, aes(x=num, y=cent, fill=groups2, colour=groups2)) + 
  geom_line(color='#666666', size=0.7) +
  geom_point() +
  ylab('Strength Centrality') + xlab ('Symptoms') + 
  scale_x_reverse() +
  scale_x_continuous(breaks = c(1:20)) +
  coord_flip() +
  theme_bw() +
  theme(panel.grid.minor.y = element_blank())

Remove the fill in the aes if you want a single line. scale_color_manual(values=c("green","yellow")) If you want to change the colour of the dots to green and yellow for example. — Haboryme
– Haboryme, Commented Nov 1, 2016 at 19:39
To connect the lines, use, group = 1 within geom_line -- geom_line(color='#666666', size=0.7, group = 1). You can use scale_color_manual to change the colors, scale_color_manual(values = c("green", "orange")). — JasonAizkalns
– JasonAizkalns, Commented Nov 1, 2016 at 19:42
Also, scale_x_reverse is getting overridden by scale_x_continuous. Use one or the other. — alistaire
– alistaire, Commented Nov 1, 2016 at 19:52

user3652621 · Accepted Answer · 2016-11-01 20:00:28Z

1

Working example:

ggplot(data2, aes(x=num, y=cent, colour=groups2)) + 
   geom_line(color='#666666', size=0.7) +
   geom_point() +
   ylab('Strength Centrality') + xlab ('Symptoms') + 
   scale_x_continuous(breaks = c(20:1)) +
   coord_flip() +
   theme_bw() + scale_color_manual(values=c("cyan","green"))+
   theme(panel.grid.minor.y = element_blank())

note the scale_color_manual(values=c(...)) and the absence of the fill parameter in the aesthetics section.

Note that if you want to reverse the ordering, you'd need to do something like scale_x_reverse(breaks=c(1:20)) since the scale_x_... options overwrite each other, with only the latest implemented.

edited Nov 1, 2016 at 20:00

answered Nov 1, 2016 at 19:46

user3652621

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