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6.4.7 Automatic Recomputation

The evaluates-to operator, ‘=>’, has the special property that any ‘=>’ formulas on the stack are recomputed whenever variable values or mode settings that might affect them are changed. See The Evaluates-To Operator.

The m C (calc-auto-recompute) command turns this automatic recomputation on and off. If you turn it off, Calc will not update ‘=>’ operators on the stack (nor those in the attached Embedded mode buffer, if there is one). They will not be updated unless you explicitly do so by pressing = or until you press m C to turn recomputation back on. (While automatic recomputation is off, you can think of m C m C as a command to update all ‘=>’ operators while leaving recomputation off.)

To update ‘=>’ operators in an Embedded buffer while automatic recomputation is off, use C-x * u. See Embedded Mode.