r - Vertical Line ggplot for x categorical variable (not date) -


i have dataframe i'm trying make vertical line on x-axis categorical.

data <- data.frame(   condition = c('1', '1', '1', '1', '1', '2', '2', '2', '2', '2', '3', '3', '3', '3', '3'),   assessmentgrade = c('400', '410', '420', '430', '440', '500', '510', '520', '530', '540',                        '300', '310', '320', '330', '340'),    freq = c('1', '2', '1', '5', '7', '9', '1', '5', '3', '4', '5', '8', '1', '3', '5'),    mathgrade = c('a+', 'b-', 'c-', 'd', 'f', 'a-', 'b', 'c+', 'd-', 'f', 'a+', 'd', 'd', 'f', 'c'),    condition = c('condition 1', 'condition 1', 'condition 1', 'condition 1', 'condition 1',                  'condition 2', 'condition 2', 'condition 2', 'condition 2', 'condition 2',                  'condition 3', 'condition 3', 'condition 3', 'condition 3', 'condition 3'))

i tried adding field make grade numeric , helped

data$gradenum <- as.numeric(data$mathgrade)

i used ggplot abubble graph wondering how edit use company's standard colors

p <- ggplot(data, aes(x = mathgrade, y = assessmentgrade, size = freq, fill = condition)) +  geom_point(aes(colour = condition)) +  ggtitle("main title") +  labs(x = "first math grade", y = "math assessment score")

how can vertical line between c+ , d? see lot of information out there if x axis date not other categorical values

just add geom_vline ;)

p + geom_vline(xintercept = 7.5)

enter image description here


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