The Stock set Method :: Classes and Objects (Programming)

Programming

The Stock set Method

The set method provides a "property name" interface like the get method. It is designed to update the number of shares, the share value, and the descriptor. The current value and the date are automatically updated.

function s = set(s,varargin)
% SET Set stock properties to the specified values
% and return the updated object
propertyArgIn = varargin;
while length(propertyArgIn) >= 2,
    prop = propertyArgIn{1};
    val = propertyArgIn{2};
    propertyArgIn = propertyArgIn(3:end);
    switch prop
    case 'NumberShares'
        s.numShares = val;
    case 'SharePrice'
        s.sharePrice = val;
    case 'Descriptor'
        s.asset = set(s.asset,'Descriptor',val);
    otherwise
        error('Invalid property')
    end
end
s.asset = set(s.asset,'CurrentValue',...
            s.numShares * s.sharePrice,'Date',date);

Note that this function creates and returns a new stock object with the new values, which you then copy over the old value. For example, given the stock object,

```
s = stock('XYZ',100,25);
```

the following set command updates the share price.

```
s = set(s,'SharePrice',36);
```

It is necessary to copy over the original stock object (i.e., assign the output to s) because MATLAB does not support passing arguments by reference. Hence the set method actually operates on a copy of the object.

The Stock get Method The Stock subsref Method