[R] Count data with several numbers separated by commas

[Xiyan Lon]

Dear all,
I have a data file with 3 variables (x1, x2, x3) where variable x1
have data that consists of several numbers separated by commas.

id name	 x1	  x2	x3
aa101	 1,4,5	  2	1
aa102	 1,2,5	  1	2
aa103	 1,2,5	  1	1
aa104	 1,2,3	  1	2
aa105	 1,5	  2	2
aa106	 1,2,5	  2	2
aa107	 1,2,5	  2	1
aa108	 1,4,5	  2	1
aa109	 1,2	  1	2
aa110	 3,5	  1	2
			

I want to count the number of data for each variables and make barplot
for each variables.
I know how to count for variable x2 and x3 and make barplot for x2 and
x3, but I don't know how to count data in variable x1.
Are there any trick how to count data in variable x1?
The result maybe like:

x1
1 9
2 6
3 2
4 4
5 8


x2
1 5
2 5

x3
1 4
2 6


Thank you for any help.

Xiyanlon