[R] similarity matrix

[set]

Hello R-users,

I've got a file with individuals as colums and the clusters where they occur
in as rows. And I wanted a similarity matrix which tells me how many times
each individual occurs with another. My eventual goal is to make
Venn-diagrams from the occurence of my individuals.

So I've this:

cluster   ind1 ind2 ind3 etc.
1            0      1     2
2            3       0    1
3            1       1     1

And I want to go to this:
            ind1      ind2      ind3
ind1      0          4            2
ind2      4          0            4
ind3      2           4           1

is there a way to do this?
Thank you for your help 

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