问题
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How to create grouped barplot with R
Species Dbh Height 1 DF 383.7143 254.3036 2 ES 403.3333 280.0000 3 F 372.0000 270.0000 4 FG 381.5000 275.0000 5 GF 351.5838 242.6522 6 HW 209.0000 198.0000 7 LP 232.8571 218.3333 8 PP 568.5000 330.0000 9 SF 136.4286 154.1000 10 WC 375.0757 234.8777 11 WL 340.0588 252.5714 12 WP 319.7273 251.3939 I want to turn the data above into a bar graph like this one. Species as bins and dbh and height as bars for each bin.
I used the code:
aggregate(ufc[,4:5],ufc[3],mean,na.rm=TRUE) to get the above data set
I can only get one variable at a time using this code:
barplot(ufc.means$Height, col=rainbow(20), names.arg=(ufc.means$Species), las=2,main="Height") 回答1:
First, do not double post! If necessary edit your previous question, rather than posting a new question.
Second, the error message that you mentioned in your earlier post is pretty self-explanatory. Here's the error message:
Error in barplot.default(ufc.means, col = rainbow(20), names.arg = (ufc.means$Species), : 'height' must be a vector or a matrix
Read that last part carefully: 'height' must be a vector or a matrix, but you are trying to use a data.frame. So, the solution is easy: convert your data.frame to a matrix before using barplot.
Assuming your data.frame is named "mydf":
mymat <- t(mydf[-1]) colnames(mymat) <- mydf[, 1] barplot(mymat, beside = TRUE) Result:
来源：https://stackoverflow.com/questions/14544124/grouped-bar-graph-using-barplot