r - Using `geom_line()` with X axis being factors -


suppose have dataframe:

hist <- data.frame(date=sys.date() + 0:13,                    counts=1:14)

i want plot total count against weekday, using line connect points. following puts points on each value:

hist <- transform(hist, weekday=factor(weekdays(date),                                        levels=c('monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday'))) ggplot(hist, aes(x=weekday, y=counts)) + geom_point(stat='summary', fun.y=sum)

when try connect them line (geom_line()), ggplot complains having 1 data observation per group , hence not able draw line between points.

i understand - it's trying draw 1 line each weekday (factor level).

how can ggplot pretend (for purposes of line only) weekdays numeric? perhaps have have column day_of_week 0 monday, 1 tuesday, etc?

if understand issue correctly, specifying group=1 , adding stat_summary() layer should trick:

ggplot(hist, aes(x=weekday, y=counts, group=1)) + geom_point(stat='summary', fun.y=sum) + stat_summary(fun.y=sum, geom="line")

enter image description here


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