[R] how to make a barplot similar to Excel’s “clustered column chart”.

[Josef . Kardos]

I have a matrix with 12 rows (one for each month), 2 columns (baseflow, 
runoff). I would like to make a barplot similar to Excel’s “clustered 
column chart”. 
 Here is my matrix ‘x’
 
8.258754        13.300710
10.180953       10.760465
11.012184       13.954887
10.910870       13.839839
9.023519        11.511129
7.189241        12.519830
5.925576        17.101491
5.211613        13.585175
5.039592        13.506304
4.462325        9.963006
5.586521        11.306202
7.739242        14.669374

If I use barplot(x, beside=T), column 1 appears on the left side of the 
plot, and then column 2 appears on the right side of the plot.  I would 
rather that they alternate, so that for month 1, I see 2 bars – column 1, 
then column 2.  And so forth for months 2-12. Is there a simple way to do 
this?  (In excel this is the chart option for “clustered column”)



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