Join the matrices

Asked Apr 17 '18 at 19:36

Active Apr 17 '18 at 19:36

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I have a question about joining matrices. Lets say

nnmat[[1, 1]] = ({{1, 3},{3, 5}});
nnmat[[1, 2]] = ({{2, 6},{4, 5}});
nnmat[[1, 3]] = ({{3, 2},{8, 7}});

Join[nnmat[[1, 1]], nnmat[[1, 2]], nnmat[[1, 3]], 2]

The above code gives me what I want but I want to extend this code into a more general situation when I have nnmat matrix more than three.

If I give an example, it will be more clear. Lets say I have a code which is wrong but it is given by using the parameter, j.

Join[{nnmat[[1,j]],{j,3}},2]

How could I rearrange the above code consisting parameter j, to give the same solution for the first example mentioned at the beginning.

Best Regards,

asked Apr 17 '18 at 19:36

ahmethasim

1

Have a look at ArrayFlatten. – Henrik Schumacher Apr 17 '18 at 19:39
You might also be interested in the techniques highlighted here: Elegant operations on matrix rows and columns – MarcoB Apr 17 '18 at 19:46
Flatten /@ Transpose[nnmat[1]]] or Flatten /@ Transpose[nnmat[1,;;3]]] – george2079 Apr 17 '18 at 19:50
1

BTW the syntax for what you are tying to do with the iterator j would be like : Join[Sequence @@ Table[nnmat[[1, j]], {j, 3}], 2] – george2079 Apr 17 '18 at 19:52
Thank you @george2079 I have solved my problem – ahmethasim Apr 18 '18 at 03:48

Join the matrices

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