2

I have this data frame

product Total
AF064   21
AF065   24
AF066   1
AF067   13
AF068   6
AF069   3
AF070   5
AF071   1
AF072   3
AF073   3
AF074   5
AF075   2
AF076   28
AF077   0
AF078   3
AF079   10
AF080   0
AF081   13
AF082   0
AF083   3
AF084   3
AF085   2
AF086   3
AF087   0
AF088   1
AF089   1
AF090   2
AF091   4
AF092   2
AF093   3
AF094   2
AF095   3
AF096   1
AF097   2
AF098   2
AF099   1
AF100   21
AF101   1
AF102   3

I want to make barplots from this dataframe.

My code is 

barplot(product,Total)
**Error in -0.01 * height : non-numeric argument to binary operator**

I also tried

barplot(dataframe)
**Error in barplot.default(dataframe) : 
  'height' must be a vector or a matrix**

I've also tried as.character for the product but still can't do the graph. I really appreciate your help guys, much thanks.

jbaums
  • 27,115
  • 5
  • 79
  • 119
user3292755
  • 383
  • 2
  • 9
  • 25

2 Answers2

1

You want the parameter of barplot to be a vector of height. You can use something like this:

barplot(dataframe[,2], names.arg=dataframe[,1])
Zaxcie
  • 36
  • 4
  • Yes, i got the graph right ,much thanks for the help. but the X-Axis didnt show each product in one graph. how can i show them all without extending the graph? – user3292755 Feb 10 '15 at 03:23
0

Your first attempt was almost right,

attach(dataframe)
barplot(Total,names.arg=product)

would do it.

Another possibility, is to turn the df into a matrix and feed it to the barplot() function.

The barplot() function will draw a bar for each column of the matrix, so you need to transpose the immediate conversion of the dataframe

m <- t( matrix(dataframe[,2],dimnames=dataframe[1]) )
barplot(m)

In case you have multiple columns (e.g. 2 to 3) in your data frame you can put all of them in the matrix, as rows:

m <- t(as.matrix(dataframe[,2:3]))
colnames(m) <- dataframe[,1]
barplot(m,legend=T)

As for your last comment, you could turn the labels sideways and resize them a little bit. I.e. using directly the dataframe

 attach(dataframe)
 barplot(Total,names.arg=product,cex.names=0.6,las=2)

or using the matrix m

 barplot(m,cex.names=0.6,las=2)
Marco Torchiano
  • 712
  • 7
  • 21
  • this helps a lot too, now i have all the names of each bars on the X-axis . Thanks for all your correction, i only knew a bit of these R functions, but now i knew better . really appreciate the help ! – user3292755 Feb 10 '15 at 12:14