FreeMat
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Section: Variables and Arrays
Creates an array of structures from a set of field, value pairs. The syntax is
y = struct(n_1,v_1,n_2,v_2,...)
where n_i
are the names of the fields in the structure array, and v_i
are the values. The values v_i
must either all be scalars, or be cell-arrays of all the same dimensions. In the latter case, the output structure array will have dimensions dictated by this common size. Scalar entries for the v_i
are replicated to fill out their dimensions. An error is raised if the inputs are not properly matched (i.e., are not pairs of field names and values), or if the size of any two non-scalar values cell-arrays are different.
Another use of the struct
function is to convert a class into a structure. This allows you to access the members of the class, directly but removes the class information from the object.
This example creates a 3-element structure array with three fields, foo
bar
and key
, where the contents of foo
and bar
are provided explicitly as cell arrays of the same size, and the contents of bar
are replicated from a scalar.
--> y = struct('foo',{1,3,4},'bar',{'cheese','cola','beer'},'key',508) y = 1x3 struct array with fields: foo bar key --> y(1) ans = foo: 1 bar: cheese key: 508 --> y(2) ans = foo: 3 bar: cola key: 508 --> y(3) ans = foo: 4 bar: beer key: 508
An alternate way to create a structure array is to initialize the last element of each field of the structure
--> Test(2,3).Type = 'Beer'; --> Test(2,3).Ounces = 12; --> Test(2,3).Container = 'Can'; --> Test(2,3) ans = Type: Beer Ounces: 12 Container: Can --> Test(1,1) ans = Type: 0 Ounces: 0 Container: 0