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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 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.