evaluate_expr function

(Shortest import: from brian2.codegen.optimisation import evaluate_expr)

brian2.codegen.optimisation.evaluate_expr(expr, ns)

Try to evaluate the expression in the given namespace

Returns either (value, True) if successful, or (expr, False) otherwise.

Examples

>>> assumptions = {'exp': DEFAULT_FUNCTIONS['exp'].pyfunc,
...                'inf': DEFAULT_CONSTANTS['inf'].value}
>>> evaluate_expr('1/2', assumptions)
(0.5, True)
>>> evaluate_expr('exp(-inf)', assumptions)
(0.0, True)
>>> evaluate_expr('sin(2*pi*freq*t)', assumptions)
('sin(2*pi*freq*t)', False)
>>> evaluate_expr('1/0', assumptions)
('1/0', False)