Edit With m = RandomInteger[9, {3, 6, 1}]
Just for completeness:
Catenate /@ m Just for diversity reasons
Apply[##&, m, {2}] Apply[Sequence, m, {-2}] Using @Mr.Wizard code I see that Catenate /@ m is really good.
Edit With m = RandomInteger[9, {3, 6, 1}]
Just for completeness:
Catenate /@ m Just for diversity reasons
Apply[##&, m, {2}] Apply[Sequence, m, {-2}] Using @Mr.Wizard code I see that Catenate /@ m is really good.