Next: Creating Structures, Up: Data Structures
A structure array is a particular instance of a structure, where each of the fields of the structure is represented by a cell array. Each of these cell arrays has the same dimensions. An example of the creation of a structure array is
x(1).a = "string1"
x(2).a = "string2"
x(1).b = 1
x(2).b = 2
which creates a 2-by-1 structure array with two fields. As previously, to print the value of the structure array, you can type its name:
octave:2> x
x =
{
a =
(,
[1] = string1
[2] = string2
,)
b =
(,
[1] = 1
[2] = 2
,)
}
Individual elements of the structure array can be returned by indexing
the variable like x (1), which returns a structure with the
two fields like
octave:2> x(1)
ans =
{
a = string1
b = 1
}
Furthermore, the structure array can return a comma separated list (see Comma Separated Lists), if indexed by one of itself field names. For example
octave:3> x.a
ans =
(,
[1] = string1
[2] = string2
,)
The function size with return the size of the structure. For
the example above
octave:4> size(x)
ans =
1 2
Elements can be deleted from a structure array in a similar manner to a numerical array, by assigning the elements to an empty matrix. For example
in = struct ('call1', {x, Inf, 'last'}, 'call2', {x, Inf, 'first'});
in (1, :) = []
=> in =
{
call1 =
(,
[1] = Inf
[2] = last
,)
call2 =
(,
[1] = Inf
[2] = first
,)
}