r - Re-ordering factor levels in data frame -

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this question has answer here:

i have data.frame shown below:

task    measure right   m1 left    m2      m3 down    m4 front   m5    m6 . . .

the task column takes 6 different values, treated factors, , ordered r as: "back", "down", "front", "left", "right", "up".

how ever, need them ordered as: "up", "down", "left", "right", "front", "back". when use data in ggplot, related tasks (such "up" , "down") plotted next each other.

how can change ordering of levels of factor "task"?

assuming dataframe mydf: 

mydf$task <- factor(mydf$task, levels = c("up", "down", "left", "right", "front", "back"))

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