Reshape - columnwise. any command to linewise?

help reshape

RESHAPE Reshape array.

RESHAPE(X,M,N) returns the M-by-N matrix whose elements are taken columnwise from X.

I need some way to turn a matrix linewise instead.

Answer 1

[Andrei Bobrov]

reshape(X.',M,N).'

[Vasco]

tytyty. =)

[Giacomo Perantoni]

The transpose operator may be expensive for a large matrix. Is there an alternative way to solve the original problem without the additional computational cost?

[winkmal]

Should M and N not be switched in your command?

[Amir]

M and N should be switched to return the M-by-N matrix.

The command should be reshape(X.',N,M).'

[Med Aymane Ahajjam]

Life saver!!! Thank you!

[sohaib bhatti]

How can the same be done if X is a 3d matrix?

[Loïc Niederhauser]

Also, what if I want to reshape to a 3d matrix? Is there anyway to just work row major in matlab?

[Bruno Luong]

Loic -Hi btw ;-) - you could use permute for ND-array (there is also pagetranspose command more restrictive)

X=randi(9,[6 5])

X = 6×5

1 2 4 9 1 9 1 7 8 1 5 6 6 4 8 4 2 7 8 2 2 4 5 5 9 7 1 7 1 8

permute(reshape(X.',[size(X,2) 2 3]),[2 1 3])

ans = 
ans(:,:,1) =

     1     2     4     9     1
     9     1     7     8     1


ans(:,:,2) =

     5     6     6     4     8
     4     2     7     8     2


ans(:,:,3) =

     2     4     5     5     9
     7     1     7     1     8