ggplot2 - R ggplot - how do you specify the order of the y axis -

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this question has answer here:

i trying create plot in r, simple has been bugging me days , can not work. when make plot r orders y axis alphabetical order, how specify order want. using example below:

x = c("high ind.", "high sp.",  "mid ind.", "mid sp.", "low ind.", "low sp.") y = c(4.6, 2.3, 5.5, 2.2, 12.6, 3) sd = c(3.2, 1.2, 4.4, 1.5, 5.9, 1.5)  qplot(x,y, xlab="water level",        ylab="mean number of ind. , sp. standard deviations") +     geom_errorbar(aes(x=x, ymin=y-sd, ymax=y+sd, width=0.2), color="blue")

i order on y axis this: high, mid, low. r automatically puts in alphabetical order. have tried many ways fix aimed @ large more complex datasets, , not work such simple set of data. there must simple way fix this..

use factor , specify level order manually:

lv <- c("high ind.", "high sp.",  "mid ind.", "mid sp.", "low ind.", "low sp.") x <- factor(lv,levels = lv)  y = c(4.6, 2.3, 5.5, 2.2, 12.6, 3) sd = c(3.2, 1.2, 4.4, 1.5, 5.9, 1.5)  dat<-data.frame(x, y, sd)  qplot(x,y, data=dat, xlab="water level", ylab="mean number of ind. , sp. standard  deviations")+geom_errorbar(aes(x=x, ymin=y-sd, ymax=y+sd, width=0.2), color="blue")

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