[R] Help on Histogram ~ Barplot

[Shivi82]

Hello All,
I need help on creating a histogram for one of my data. The data is as below
(sample):
MFST_WT	Hours	PROCESS	Month	Weekday	Day of the Month
6,828	13	       INBOUND	Mar	             Fri	13
2,504	16	       INBOUND	Mar	             Fri	27
20	        16	       INBOUND	Mar	             Fri	27
10,262	16	       INBOUND	Mar	             Fri	27
2,500	17	       INBOUND	Mar	             Fri	13
3,938	16	       INBOUND	Feb	            Thu	26
798	        10	       INBOUND	Feb	            Sat	14
5,439	15	       INBOUND	Feb	            Mon	16

This data has these columns and total rows are 45000. 
Now I need to group the data and create a bar plot based on total weight on
a monthly basis. The code I have used is:
barplot(mwlc$MFST_WT, names.arg = mwlc$Month, las=2, ylim=c(0,10000), col
="red",
        border="orange", main="Monthly Weight")
but this is showing an error. Please suggest. 




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