MATLAB Programming

9 Classes and Objects
error('Asset properties: Descriptor, Date, CurrentValue')
end
end
Subclass set methods call the asset set method and require the capability to
return the modified object since MATLAB does not support passing arguments
by reference. See “The Stock set Method” on page 9-53 for an example.
The Asset subsref Method
The subsref method provides access to the data contained in an asset object
using one-based numeric indexing and structure field name indexing. The
outer switch statement determines if the index is a numeric or field name
syntax. The inner switch statements map the index to the appropriate value.
MATLAB calls subsref whenever you make a subscripted reference to an
object (e.g., A(i), A{i}, orA.fieldname).
function b = subsref(a,index)
%SUBSREF Define field name indexing for asset objects
switch index.type
case '()'
switch index.subs{:}
case 1
b = a.descriptor;
case 2
b = a.date;
case 3
b = a.currentValue;
otherwise
error('Index out of range')
end
case '.'
switch index.subs
case 'descriptor'
b = a.descriptor;
case 'date'
b = a.date;
case 'currentValue'
b = a.currentValue;
9-46