unshiftdata

This example shifts x, a 3-by-3 magic square, permuting dimension 2 to the first column. unshiftdata shifts x back to its original shape.

Create a 3-by-3 magic square.

x = magic(3)

x = 3×3

     8     1     6
     3     5     7
     4     9     2

Shift the matrix x to work along the second dimension. The permutation vector, perm, and the number of shifts, nshifts, are returned along with the shifted matrix.

[x,perm,nshifts] = shiftdata(x,2)

x = 3×3

     8     3     4
     1     5     9
     6     7     2

perm = 1×2

     2     1

nshifts =

     []

Shift the matrix back to its original shape.

y = unshiftdata(x,perm,nshifts)

y = 3×3

     8     1     6
     3     5     7
     4     9     2

This example shows how shiftdata and unshiftdata work when you define dim as empty.

Define x as a row vector.

x = 1:5

x = 1×5

     1     2     3     4     5

Define dim as empty to shift the first nonsingleton dimension of x to the first column. shiftdata returns x as a column vector, along with perm, the permutation vector, and nshifts, the number of shifts.

[x,perm,nshifts] = shiftdata(x,[])

x = 5×1

     1
     2
     3
     4
     5

perm =

     []

nshifts = 
1

Using unshiftdata, restore x to its original shape.

y = unshiftdata(x,perm,nshifts)

y = 1×5

     1     2     3     4     5