Google了一下,试了下可以。
http://stackoverflow.com/questions/38369855/how-to-put-exact-number-of-decimal-places-on-label-ggplot-bar-chart
How can I specify the exact number of decimal places on ggplot bar chart labels?
The data:
strefa <- c(1:13)
a <- c(3.453782,3.295082,3.137755,3.333333,3.500000,3.351351,3.458824,3.318681,3.694175,3.241379,3.138298,3.309524,3.380000)
srednie <- data.frame(strefa,a)
The code is:
ggplot(srednie, aes(x=factor(strefa), y=a, label=round(a, digits = 2))) +
geom_bar(position=position_dodge(), stat="identity", colour="darkgrey", width = 0.5) +
theme(legend.position="none",axis.text.x = element_blank(), axis.ticks.x = element_blank(), axis.ticks.y = element_blank()) +
geom_text(size = 4, hjust = 1.2) +
coord_flip(ylim = c(1,6))+
xlab("") +
ylab("")
As you can see, on bars entitled 5 and 2 the labels are limited to the 1st decimal place. How to show 2 decimal places even if there is i.e. 3.000000 or 5.999999? In such a cases I would like to show 3.00 and 6.00.
I tried to use as a aes parameter label=round(a, digits = 2) but it doesn't work.
r ggplot2 bar-chart
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edited Jul 14 '16 at 12:04
You could try the following as it rounds to two digits and prints two digits after the decimal.
ggplot(srednie, aes(x=factor(strefa), y=a, label=sprintf("%0.2f", round(a, digits = 2)))) +
geom_bar(position=position_dodge(), stat="identity", colour="darkgrey", width = 0.5) +
theme(legend.position="none",axis.text.x = element_blank(), axis.ticks.x = element_blank(), axis.ticks.y = element_blank()) +
geom_text(size = 4, hjust = 1.2) +
coord_flip(ylim = c(1,6))+
xlab("") +
ylab("")
The only modification was changing your code from
round(a, digits = 2)
to
sprintf("%0.2f", round(a, digits = 2))
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