returns True if expr is a machineprecision real or complex number, and returns False otherwise.


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Basic Examples  (1)

Check whether numbers are machine numbers or not:

Scope  (1)

Complex numbers:

Complex numbers are only considered machine numbers if both real and imaginary parts are machine numbers:

Applications  (1)

Solve a differential equation, stopping when out of the range of machine numbers:

Properties & Relations  (1)

Any machine number has precision given as MachinePrecision:

Possible Issues  (1)

Subnormal machine numbers are MachineNumberQ:

However, they effectively have less precision than MachinePrecision and have the same uncertainty as $MinMachineNumber:

Introduced in 1991