r - order the ggplot x-axis using a list -


i have dataframe plot barchart categorical x-values in specific order specify list. show example using mtcars dataset.

#get small version of mtcars dataset , add named column mtcars2 <- mtcars mtcars2[["car"]] <- rownames(mtcars2) mtcars2 <- mtcars[0:5,] # plot using following p = ggplot(mtcars2, aes(x=car, y=mpg))+ geom_bar(stat="identity")

the values of x-axis sorted in alphabetical order. if have list of cars , ggplot preserve order:

#list out of alphabetical order orderlist = c("hornet 4 drive", "mazda rx4 wag", "mazda rx4",                "datsun 710", "hornet sportabout")   # plot bar graph above preserve plot order # this: p = ggplot(mtcars2, aes(x= reorder( car, orderlist), y=mpg))+ geom_bar(stat="identity")

any pointers appreciated, zach cp

set levels on car factor order want them, e.g.:

mtcars2 <- transform(mtcars2, car = factor(car, levels = orderlist))

then plot works without further intervention:

ggplot(mtcars2, aes(x=car, y=mpg))+ geom_bar(stat="identity")

enter image description here


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