orderfields - Order fields of structure array

Syntax

Description

s = orderfields(s1) orders the fields in s1 so that the new structure array s has field names in ASCII dictionary order.

s = orderfields(s1, s2) orders the fields in s1 so that the new structure array s has field names in the same order as those in s2. Structures sl and s2 must have the same fields.

s = orderfields(s1, c) orders the fields in s1 so that the new structure array s has field names in the same order as those in the cell array of field name strings c. Structure s1 and cell array c must contain the same field names.

s = orderfields(s1, perm) orders the fields in s1 so that the new structure array s has fieldnames in the order specified by the indices in permutation vector perm.

If s1 has N fieldnames, the elements of perm must be an arrangement of the numbers from 1 to N. This is particularly useful if you have more than one structure array that you would like to reorder in the same way.

[s, perm] = orderfields(...) returns a permutation vector representing the change in order performed on the fields of the structure array that results in s.

Tips

orderfields only orders top-level fields. It is not recursive.

Examples

Create a structure s. Then create a new structure from s, but with the fields ordered alphabetically:

s = struct('b', 2, 'c', 3, 'a', 1)
s = 
    b: 2
    c: 3
    a: 1

snew = orderfields(s)
snew = 
    a: 1
    b: 2
    c: 3

Arrange the fields of s in the order specified by the second (cell array) argument of orderfields. Return the new structure in snew and the permutation vector used to create it in perm:

[snew, perm] = orderfields(s, {'b', 'a', 'c'})
snew = 
    b: 2
    a: 1
    c: 3
perm =
     1
     3
     2

Now create a new structure, s2, having the same fieldnames as s. Reorder the fields using the permutation vector returned in the previous operation:

s2 = struct('b', 3, 'c', 7, 'a', 4)
s2 = 
    b: 3
    c: 7
    a: 4

snew = orderfields(s2, perm)
snew = 
    b: 3
    a: 4
    c: 7

See Also

fieldnames | getfield | isfield | rmfield | setfield | struct

How To

• dynamic field names

© 1984-2012- The MathWorks, Inc.    -   Site Help   -   Patents   -   Trademarks   -   Privacy Policy   -   Preventing Piracy   -   RSS