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Hi I'd like to transform the matrix : 

{{{184.586, 1.02758*10^8}, {139.94, 4.07249*10^7}, {117.72, 
   2.26123*10^7}, {109.528, 1.51412*10^7}, {95.7636, 
   8.68593*10^6}, {78.125, 5.16118*10^6}, {66.6777, 
   3.1014*10^6}}, {{183.505, 1.01147*10^8}, {138.25, 
   4.02021*10^7}, {115.814, 2.24641*10^7}, {108.22, 
   1.50985*10^7}, {91.3082, 9.28241*10^6}, {78.1087, 
   6.03119*10^6}, {65.9855, 3.56718*10^6}}}

with the same transformation as 

{{{a,b},{c,d}},{{e,f},{g,h}}}

into 

{{a,b},{c,d},{e,f},{g,h}}

How can I do plz ?

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    $\begingroup$ At least closely related: mathematica.stackexchange.com/q/5233/5478 $\endgroup$
    – Kuba ♦
    Jun 27, 2019 at 8:31
  • 2
    $\begingroup$ I guess gh is a typo and should be g, h. Anyway, it's a bit uncertain what you actually are trying to do. One way to achieve the structural change seen here is Join @@ {{{a,b},{c,d}},{{e,f},{g,h}}}... (This can be also defined as a function Apply[Join]. Another, probably more understandable way is Flatten[{{{a,b},{c,d}},{{e,f},{g,h}}}, 1]. $\endgroup$
    – kirma
    Jun 27, 2019 at 8:38

3 Answers 3

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Flatten might be something you need:

listNested = {{{a, b}, {c, d}}, {{e, f}, {g, h}}};
Flatten[listNested, {1, 2}]

output:

{{a, b}, {c, d}, {e, f}, {g, h}}
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$\begingroup$ 
Catenate@list

where 

list = {{{a,b},{c,d}},{{e,f},{g,h}}}

{{a, b}, {c, d}, {e, f}, {g, h}}

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You can also use Join:

Apply[Join] @ {{{a, b}, {c, d}}, {{e, f}, {g, h}}}

{{a, b}, {c, d}, {e, f}, {g, h}}

Alternative/equivalent form: Join @@ {{{a, b}, {c, d}}, {{e, f}, {g, h}}}

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