MATLAB FINANCIAL DERIVATIVES TOOLBOX Manual do Utilizador descarregar pdf (Página 92)

individual field contents when you type the array name. Instead, it shows a

summary of the kind of information the structure contains.

You can also use the

function to obtain this information.

s returns a cell array of strings containing field names (see the

online help).

As you expand the structure, Matlab fills in unspecified fields with empty

matrices so that:

• All structures in the array have the same number of fields

• All fields have the same field names

For example, entering “patient(3).name = 'Alan Johnson' ” expands the

patient array to size [1 3]. Now both “patient(3).billing” and “patient(3).test”

contain empty matrices. To see this, type: “patient(3)” to get:

“ans =

name: 'Alan Johnson'

billing: []

test: [] ”

Building structure arrays using the

t function

You can pre-allocate an array of structures with the

t function. Its basic

form is [2]:

“str_array =

t ('field1',val1,'field2',val2, ...)”

where the arguments are field names and their corresponding values. A field

value can be a single value, represented by any Matlab data construct, or a

cell array of values. All field values in the argument list must be of the same

scale (single value or cell array). To create the structure with the patient info

shown before you should have the following syntax (the first command line

instructs for the creation of a 1-by-3 structure will all fields set to empty):

“patient(3)=

t ('name',[],'billing',[],'test',[]);

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 118 119

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