Function sequant::mbpt::screen_vac_av¶

Defined in File utils.cpp

Function Documentation¶

ExprPtr sequant::mbpt::screen_vac_av(ExprPtr expr, bool skip_clone = false)¶

Screens out terms in the expression expr that cannot contribute to expectation value.

Parameters:

expr – input expression
skip_clone – if true, will not clone the input expression

Returns:

return screened expression

// example usage:
auto expr1 = screen_vac_av(expr); // screens for <0| expr |0>
auto expr2 = screen_vac_av(P(2) * expr); // screens for <P(2)| expr |0>

Pre:

This function expects input to be composed of mbpt::Operators