[R] gapped sequence data summary

[jd6688]

   Id cat1 location item_values p-values sequence 
a111 1 3002737     100             0.01       1 
a112 1 3017821     102             0.05       2 
a113 2 3027730     103             0.02       3 
a114 2 3036220     104             0.04       4 
a115 1 3053984     105             0.03       5 

a118 1 3090500     106             0.02       8 
a119 1 3103304     107             0.03       9       
a120 2 3090500     106             0.02       10 
a121 2 3103304     107             0.03       11     

what I am trying to accomplish is:

for sequence 1:5
       cat1        start of the location   end of the location,   peak value
of the item_values
          1          3002737                    3053984                 105
          2           3027730                    3036220                104

for sequence 8:11

       cat1        start of the location   end of the location,   peak value
of the item_values
          1          3090500                   3103304                  107
          2          3090500                   3103304                  107

and so on...

I have been trying to find a way to accomplish this, however, I didn't find
one that worked as expected.
would you shed some light on this? Thanks,


     
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