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How can I sort the X axis in a Barplot in R?

Answer 1

+2 A:

I really want to help answer your question, but I gotta tell you, I can't make heads or tails of your data. I see a lot of opening parenthesis but no closing ones. The data looks sorted descending by whatever the values are on the bottom of each row. I have no idea what to make out of a value like "(8.048,18.05]"

Am I missing something obvious? Can you make a more simple example where your data structure is not a factor?

I would generally expect a data frame or a matrix with two columns, one for the X and one for the Y.

See if this example of sorting helps (I'm sort of shooting in the dark here)

tN <- table(Ni <- rpois(100, lambda=5))
r <- barplot(tN)

#stop here and examine the plot
#the next bit converts the matrix to a data frame,
#  sorts it, and plots it again

df<-data.frame(tN)
df2<-df[order(df$Freq),]
barplot(df2$Freq)

JD Long 2009-02-21 01:54:56

He is using the general mathematics range notation, [] is closed interval, () is open interval. So for his first bin: (8.048,18.05] = 81, that means that for the range 8.048 < x <= 18.05, there were 81 elements in that range.

FryGuy 2009-02-21 02:05:11

See http://en.wikipedia.org/wiki/Interval_%28mathematics%29

FryGuy 2009-02-21 02:05:47

Ohhhhh! Thank you for straightening that out. I had not seen output from R that looked like that, so I was flummoxed.

JD Long 2009-02-25 00:50:22

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How can I sort the X axis in a Barplot in R?

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