MATLAB Programming

Designing User Classes in MATLAB
The first argument is the object being referenced. The second argument, S,
is a structure array with two fields:
• S.type is a string containing '()', ’{}', or'.' specifying the subscript
type. The parentheses represent a numeric array; the curly braces, a cell
array; and the dot, a structure array.
• S.subs is a cell array or string containing the actual subscripts. A colon
used as a subscript is passed as a cell array containing the string ':'.
For instance, the expression
A(1:2,:)
causes MATLAB to call subsref(A,S), whereS is a 1-by-1 structure with
S.type = '()'
S.subs = {1:2,':'}
Similarly, the expression
uses
A{1:2}
S.type ='{}'
S.subs = {1:2}
The expression
A.field
calls subsref(A,S) where
S.type = '.'
S.subs = 'field'
These simple calls are combined for more complicated subscripting
expressions. In such cases, length(S) is the number of subscripting levels.
For example,
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