I want to change the colors of hline "a, d, j, " to red , so what should i do?!!!

[Xuan]

library(tidyverse)
set.seed(13)
names<-letters[1:10]
var1<-rnorm(10,25,5)
dat5<-tibble(names,var1)

Plot

ggplot(dat5, aes(x=reorder(names,var1), y=var1)) +
geom_segment( aes( xend=names, yend=0), color="darkolivegreen4") +
geom_point(color="chartreuse4") +
labs(y= "Variable 1", x="")

[FJCC]

Do you mean something like this?

library(tidyverse)
set.seed(13)
names<-letters[1:10]
var1<-rnorm(10,25,5)
dat5<-tibble(names,var1)

ggplot(dat5, aes(x=reorder(names,var1), y=var1)) +
  geom_segment( aes( xend=names, yend=0), color="darkolivegreen4") +
  geom_point(color="chartreuse4") +
  geom_segment(aes(x="i",xend="c",y=0,yend=0),color="red")+
  labs(y= "Variable 1", x="")

^{Created on 2022-01-05 by the reprex package (v2.0.1)}

[jrkrideau]

I think Xuan wants something like this

library(tidyverse)
set.seed(13)
names<-letters[1:10]
var1<-rnorm(10,25,5)
dat1<-tibble(names,var1)

dat2 <-   dat1 %>%  mutate(xx = case_when(names == "a" ~ 'red'
                                          ,names == "d" ~ 'red'
                                          ,names == "j" ~ 'red'
                                          ,TRUE ~ 'yellow'
) )


ggplot(dat2, aes(x=reorder(names,var1), y=var1, colour = xx)) +
  geom_segment( aes( xend=names, yend=0)) +
  geom_point() + 
  labs(y= "Variable 1", x="")

but to get the colours correct I think I need to use scale_fill_manual() and I don't have time futz around with it at the moment

[Yeongchull_Choi]

library(tidyverse)
set.seed(13)
names<-letters[1:10]
var1<-rnorm(10,25,5)
var2 <- c("a", "b", "b","a", "b", "b", "b", "b", "b", "a")
dat5<-tibble(names,var1, var2)

ggplot(dat5, aes(x=reorder(names,var1), y=var1, color = var2)) +
geom_segment( aes( xend=names, yend=0)) +
geom_point() +
scale_color_manual(values = c("red", "chartreuse4")) +
labs(y= "Variable 1", x="")

[Xuan]

Yepppp, thank for your help but can you tell me how to make annotations about color not appear in the chart

[Xuan]

Thank youuuuu, to me, your code is the easiest to understand, but i want to uncomment the color in plot, only plot like picture i posted yesterday, without caption.

[Xuan]

I wanna change the circled lines to red

[Matthias]

# define the ones you want to highlight
highlight = c("a", "d", "j")
  
# add an extra column
dat2 <-   dat1 %>%  
  mutate(to_highlight = if_else(names %in% highlight,
                                "yes", "no"))


ggplot(dat2, aes(x=reorder(names,var1), 
                 y=var1,
                 #define the colour based on highlight column
                 colour = to_highlight)) +
  geom_segment( aes( xend=names, yend=0)) +
  geom_point() + 
  labs(y= "Variable 1", x="") +
  # define the colours to be used
  scale_colour_manual(values = c("yes" = "red",
                               "no" =  "chartreuse4"))  + 
  # hide the legend
  theme(legend.position = "none")

[Xuan]

Greatttt!!!! This is what i want. Thank you so much and thank for explaining code, so perspicuous.