How do I remove curly brackets around each element in a list?

Question

I have a list/array like so:

{{{1}, {2}, {3}, {4}, {5}, {6}}, {{7}, {8}, {9}, {10}, ... }}

I want to remove the curly brackets around each element (so I can use ListDensityPlot) so that I have:

{{1, 2, 3, 4, 5, 6}, {7, 8, 9, ...}}

Flatten[{{{1, 2}, {3, 4}, {5, 6}}, {{7, 8}, {9, 10}}}, {{1}, {2, 3}}]. (Pretty sure this is a dupe...) — J. M.'s missing motivation, Jul 31 '17 at 16:34
Or perhaps even Flatten /@ {{{1, 2}, {3, 4}, {5, 6}}, {{7, 8}, {9, 10}}} — ktm, Jul 31 '17 at 16:40
{{{1}, {2}, {3}, {4}, {5}, {6}}, {{7}, {8}, {9}, {10}}}[[All, All, 1]] — m_goldberg, Jul 31 '17 at 17:20

eldo · Answer 1 · 2017-07-31T18:29:04.810

7

list = {{{1}, {2}, {3}, {4}, {5}, {6}}, {{7}, {8}, {9}, {10}}};

Flatten /@ list

{{1, 2, 3, 4, 5, 6}, {7, 8, 9, 10}}

Or use the operator form

Map[Flatten] @ list

edited Jul 31 '17 at 18:29

answered Jul 31 '17 at 16:41

eldo

score 4 · Answer 2 · answered Jul 31 '17 at 17:46

4

Just to put my comment on record, I propose

{{{1}, {2}, {3}, {4}, {5}, {6}}, {{7}, {8}, {9}, {10}}}[[All, All, 1]]

which gives

{{1, 2, 3, 4, 5, 6}, {7, 8, 9, 10}}

answered Jul 31 '17 at 17:46

m_goldberg

I see that you have adopted my solution since this was last asked. ;^) – Mr.Wizard Jul 31 '17 at 22:19
1

@Mr.Wizard. Why not? Your methods are often the best, and I can still learn even at my advanced age. – m_goldberg Jul 31 '17 at 23:59
I am sincerely flattered. Also I strongly suspect your memory works better than mine, age notwithstanding. – Mr.Wizard Aug 01 '17 at 09:46

score 1 · Answer 3 · answered Jul 31 '17 at 18:15

1

Given your list as:

list = {{{1}, {2}, {3}, {4}, {5}, {6}}, {{7}, {8}, {9}, {10}}};

Use Flatten to remove the inner brackets.

Flatten /@ list

Which gives:

{{1, 2, 3, 4, 5, 6}, {7, 8, 9, 10}}

answered Jul 31 '17 at 18:15

Giovanni Baez

3 Answers3