MATLAB Programming Fundamentals - MathWorks

Concatenate Structures

This example shows how to concatenate structure arrays using the [] operator. To

concatenate structures, they must have the same set of fields, but the fields do not need

to contain the same sizes or types of data.

Create scalar (1-by-1) structure arrays struct1 and struct2, each with fields a and b:

struct1.a = 'first';

struct1.b = [1,2,3];

struct2.a = 'second';

struct2.b = rand(5);

struct1,struct2

struct1 = struct with fields:

a: 'first'

b: [1 2 3]

struct2 = struct with fields:

a: 'second'

b: [5x5 double]

Just as concatenating two scalar values such as [1,2] creates a 1-by-2 numeric array,

concatenating struct1 and struct2 creates a 1-by-2 structure array.

combined = [struct1,struct2]

combined = 1x2 struct array with fields:

a

b

When you want to access the contents of a particular field, specify the index of the

structure in the array. For example, access field a of the first structure.

combined(1).a

ans =

'first'

Concatenation also applies to nonscalar structure arrays. For example, create a 2-by-2

structure array named new. Because the 1-by-2 structure combined and the 2-by-2

Concatenate Structures