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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

© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/Operator-Overloading.html