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up vote 6 down vote favorite

I have 

{{{{2/3, 0}, {0, 0}}, {{0, Sqrt[2]/3}, {0, 0}}}, {{{0, 0}, {Sqrt[2]/3,
 0}}, {{0, 0}, {0, 1/3}}}}

I need

{{2/3, 0, 0, Sqrt[2]/3}, {0, 0, 0, 0}, {0, 0, 0, 0}, {Sqrt[2]/3, 0, 0, 1/3}}

How can I do that?

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up vote 8 down vote

ArrayFlatten will do the job:

ArrayFlatten[
 {
  {
   {{2/3, 0}, {0, 0}},
   {{0, Sqrt[2]/3}, {0, 0}}
  },
  {
   {{0, 0}, {Sqrt[2]/3, 0}},
   {{0, 0}, {0, 1/3}}
  }
 }
]

(* Out:
{{2/3, 0, 0, Sqrt[2]/3}, 
 {0, 0, 0, 0}, 
 {0, 0, 0, 0}, 
 {Sqrt[2]/3, 0, 0, 1/3}}
*)
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