- This message is generated when a machine-precision computation produces a machine underflow—that is, a machine number that cannot be put in its normal form.
- When an underflow occurs, some of the binary digits in the result are essentially discarded. Depending on the number of digits discarded and whether any of them contained the value one, it is possible to lose some, all, or no accuracy in the result.
- If all binary digits are lost, the result is a machine zero 0.`.
- The message is not issued for operations on machine (packed) arrays.
- Machine underflow can be avoided by using arbitrary-precision numbers.
- Off[message] switches off the message; On[message] switches it on. For example: Off[General::munfl].
Basic Examples (4)
$MinMachineNumber is the smallest positive machine number that can be put in normal form:
Use SetPrecision to convert a machine number to arbitrary precision and avoid underflow: