friendlysam.opt.Sub

class friendlysam.opt.Sub

Subtraction operator.

See Operation for a general description of operations.

Parameters:*args – Should be exactly two items to subtract.

Examples

>>> x = VariableCollection('x')
>>> expr = x(1) - x(2)
>>> expr
<friendlysam.opt.Sub at 0x...>
>>> expr == Sub(x(1), x(2))
True
>>> x(1).value, x(2).value = 2, 3
>>> float(expr)
-1.0

Sub.create(*args)	Classmethod to create a new object.
Sub.evaluate([replace, evaluators])	Evaluate the expression recursively.

Sub.args	This property holds the arguments of the operation.
Sub.leaves	The leaves of the expression tree.
Sub.value	The concrete value of the expression, if possible.
Sub.variables	This property gives all leaves which are instances of Variable.