[R] Count cell Count by her frequency

[Mat]

Hello togehter, i have a data.frame, with value like this:

        A       B
1     10-1  aaa
2     10-1  bbb
3     10-1  abc
4     10-2  vvv
5     10-3  ggg

I want now a evaluation, which character is how often in my data.frame. Like
this one:
     A         B
1   10-1   3
2   10-2   1
3   10-3   1

How can i do this?

Thank you.

Mat



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