R: Plot: Re-arranging the order of variables -


i want create barplot in r. however, re-arrange variables on x-axis, not frequency 'meaning'.

imagine have following data set:

df<-data.frame(read.table(header=true, text=" id  radio 1   2   b 3   4   c 5   d 6   d 7   e 8   e 9   10  b 11  c 12  e 13  c 14  15  d 16  17  c 18  19  20  f 21  22  c 23  c 24  25  b 26  27  c 28  29  b 30  c"))

i want use plot depict frequencies. 

plot(df$radio)

obviously, r create barplot, ordered levels of factor df$radio (i.e. a b c d e f). let us, however, assume, order should be: c e b a d f. (in real-case case behind scenario variable dr$radio stands the last time respondent has been using radio. c stands 'today', e 'last week' etc.)

i not sure re-arrange order in barplot. tried re-arrange order of levels of df$radio. however, messed factor variable. also, tried solve problem using `order' in plot-code no avail, too. ideas? appreciated!

we can use factor levels specified

plot(factor(df$radio, levels=c("c", "e", "b", "a", "d", "f")))

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