Variable: calc-use-selections
calc-use-selections is a variable defined in calc.el.gz.
Value
t
Documentation
If non-nil, commands operate only on selected portions of formulas.
If nil, selections displayed but ignored.
Source Code
;; Defined in /usr/src/emacs/lisp/calc/calc.el.gz
(defcalcmodevar calc-use-selections t
"If non-nil, commands operate only on selected portions of formulas.
If nil, selections displayed but ignored.")