function enable(string $name) {
        if (!isset($this->_formulaList[$name])) {
            Console::warning("Formula \"$name\" do not exist.");
            return;
        }
        $this->_enableList = $this->_enableList + [$name];
    }
function enable(string $name) {
        if (!isset($this->_formulaList[$name])) {
            Console::warning("Formula \"$name\" do not exist.");
            return;
        }
        $this->_enableList = $this->_enableList + [$name];
    }
function enable ( string $ name ) { if ( ! isset ( $ this -> _formulaList [ $ name ] ) ) { Console :: warning ( "Formula \"$name\" do not exist." ) ; return ; } $ this -> _enableList = $ this -> _enableList + [ $ name ] ; }
Enable formula.

@param string $name
Enable formula .