reshape列优先

 

A =

1 4 7 10

2 5 8 11

3 6 9 12

 

B = reshape(A,2,6)

 

B =

1 3 5 7 9 11

2 4 6 8 10 12

B = reshape(A,2,[])

B =

1 3 5 7 9 11

2 4 6 8 10 12

 

 

 

 RESHAPE(X,M,N) returns the M-by-N matrix whose elements

 are taken columnwise from X.  An error results if X does

  not have M*N elements.

 

 

rowwise just RESHAPE(X',M,N)'