3
$\begingroup$

I have this multidimensional matrix:

{{{{a1, a2}, {a3, a4}}, {{b1, b2}, {b3, b4}}}, {{{c1, c2}, {c3, c4}}, {{d1, d2}, {d3, d4}}}}

I would like to convert it into this regular matrix:

{{a1, a2, b1, b2}, {a3, a4, b3, b4}, {c1, c2, d1, d2}, {c3, c4, d3, d4}}

I have tried to use Flatten and Partition, but then I get this result:

{{a1, a2, a3, a4}, {b1, b2, b3, b4}, {c1, c2, c3, c4}, {d1, d2, d3, d4}}

Thanks in advance :-)

$\endgroup$
3
$\begingroup$

Here is what you need:

Flatten[
   {
      {{{a1, a2}, {a3, a4}}, {{b1, b2}, {b3, b4}}}, 
      {{{c1, c2}, {c3, c4}}, {{d1, d2}, {d3, d4}}}
   }
   , 
   {{1, 3}, {2, 4}}
]

Have a look here for an explanation.

| improve this answer | |
$\endgroup$
4
$\begingroup$

You can use ArrayFlatten for this:

ArrayFlatten[{{{{a1, a2}, {a3, a4}}, {{b1, b2}, {b3, b4}}},
              {{{c1, c2}, {c3, c4}}, {{d1, d2}, {d3, d4}}}}]

(* {{a1, a2, b1, b2}, {a3, a4, b3, b4}, {c1, c2, d1, d2}, {c3, c4, d3, d4}} *)
| improve this answer | |
$\endgroup$
  • $\begingroup$ IMHO this is the correct answer. +1 $\endgroup$ – Mr.Wizard Mar 16 '14 at 13:54

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.