[R] Sum results in a matrix

[RMSOPS]

Hello,
     With the following code get the results array
res3<-table(df$v_source,df$v_destine)

  1  2  3  4  5  6  7
  1  0 10  0  0  0  0  0
  2 11  0  0  0  0  0  0
  3  0  0 18 15  0  0  0
  4  0  0 15 11  0  0  0
  5  0  0  0  0  1  0  0
  6  0  0  0  0  0  1  0
  7  0  0  0  0  0  0 18


my idea was to create a new table of results from res3 but making the sum of
the results where the position of the origin and destination were reversed.

    for example
         [1,2]= 10
          [2,1]=11

 New Table Final.
 points         result 
 [1 and 2]    21
 
thanks
   



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