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edited Nov 22, 2014 at 4:54

This is a straightforward application of GatherBy and Map (\@/@):

First /@ GatherBy[mydata, First]

(* {{1, a, aa}, {2, d, dd}, {3, f, ff}, {4, i, ii}, {5, n, nn}, {7, p, pp}} *)

You could also use Part ([[]]) to get the first element of each group.

GatherBy[mydata, First][[All,1]]

This is a straightforward application of GatherBy and Map (\@):

First /@ GatherBy[mydata, First]

(* {{1, a, aa}, {2, d, dd}, {3, f, ff}, {4, i, ii}, {5, n, nn}, {7, p, pp}} *)

You could also use Part ([[]]) to get the first element of each group.

GatherBy[mydata, First][[All,1]]

This is a straightforward application of GatherBy and Map (/@):

First /@ GatherBy[mydata, First]

(* {{1, a, aa}, {2, d, dd}, {3, f, ff}, {4, i, ii}, {5, n, nn}, {7, p, pp}} *)

You could also use Part ([[]]) to get the first element of each group.

GatherBy[mydata, First][[All,1]]

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created Nov 22, 2014 at 4:51

This is a straightforward application of GatherBy and Map (\@):

First /@ GatherBy[mydata, First]

(* {{1, a, aa}, {2, d, dd}, {3, f, ff}, {4, i, ii}, {5, n, nn}, {7, p, pp}} *)

You could also use Part ([[]]) to get the first element of each group.

GatherBy[mydata, First][[All,1]]