Operator Overloading (GNU Octave (version 11.0.90))

#### 34.4.2 Operator Overloading ¶

The following table shows, for each built-in numerical operation, the corresponding function name to use when providing an overloaded method for a user class.

Operation | Method | Description
--- | --- | ---
`a + b` | `plus (a, b)` | Binary addition
`a - b` | `minus (a, b)` | Binary subtraction
`+a` | `uplus (a)` | Unary addition
`-a` | `uminus (a)` | Unary subtraction
`a .* b` | `times (a, b)` | Element-wise multiplication
`a * b` | `mtimes (a, b)` | Matrix multiplication
`a ./ b` | `rdivide (a, b)` | Element-wise right division
`a / b` | `mrdivide (a, b)` | Matrix right division
`a .\ b` | `ldivide (a, b)` | Element-wise left division
`a \ b` | `mldivide (a, b)` | Matrix left division
`a .^ b` | `power (a, b)` | Element-wise power
`a ^ b` | `mpower (a, b)` | Matrix power
`a < b` | `lt (a, b)` | Less than
`a <= b` | `le (a, b)` | Less than or equal to
`a > b` | `gt (a, b)` | Greater than
`a >= b` | `ge (a, b)` | Greater than or equal to
`a == b` | `eq (a, b)` | Equal to
`a != b` | `ne (a, b)` | Not equal to
`a & b` | `and (a, b)` | Logical and
`a | b` | `or (a, b)` | Logical or
`!a` | `not (a)` | Logical not
`a'` | `ctranspose (a)` | Complex conjugate transpose
`a.'` | `transpose (a)` | Transpose
`a:b` | `colon (a, b)` | Two element range
`a:b:c` | `colon (a, b, c)` | Three element range
`[a, b]` | `horzcat (a, b)` | Horizontal concatenation
`[a; b]` | `vertcat (a, b)` | Vertical concatenation
`a(s_1,…,s_n)` | `subsref (a, s)` | Subscripted reference
`a(s_1,…,s_n) = b` | `subsasgn (a, s, b)` | Subscripted assignment
`b(a)` | `subsindex (a)` | Convert object to index
`disp` | `disp (a)` | Object display

Table 34.1: Available overloaded operators and their corresponding class method

An example `mtimes` method for the polynomial class might look like

    function p = mtimes (a, b)
      p = polynomial (conv (double (a), double (b)));
    endfunction