underflow

(redirected from underflows)
Also found in: Dictionary.

underflow

[′ən·dər‚flō]
(computer science)
The generation of a result whose value is smaller than the smallest quantity that can be represented or stored by a computer.

underflow

(programming)
(or "floating point underflow", "floating underflow", after "overflow") A condition that can occur when the result of a floating-point operation would be smaller in magnitude (closer to zero, either positive or negative) than the smallest quantity representable. Underflow is actually (negative) overflow of the exponent of the floating point quantity. For example, an eight-bit twos complement exponent can represent multipliers of 2^-128 to 2^127. A result less than 2^-128 would cause underflow.

Depending on the processor, the programming language and the run-time system, underflow may set a status bit, raise an exception or generate a hardware interrupt or some combination of these effects. Alternatively, it may just be ignored and zero substituted for the unrepresentable value, though this might lead to a later divide by zero error which cannot be so easily ignored.

underflow

(1) An error condition that occurs when the result of a computation is smaller than the smallest quantity the computer can store.

(2) An error condition that occurs when an item is called from an empty stack.
References in periodicals archive ?
For image authentication, the histogram shifting was adopted to avoid the risks of underflows and overflows in Tai's reversible watermarking scheme [18].
However, they did not employ any mechanisms to prevent underflows and overflows caused by expanding of prediction errors.
15 mm from the clean coal classifying cyclones are discarded as waste along with the underflow streams from the fine wire sieves and the refuse high-frequency screen.
The best alternative was considered to be a flotation circuit incorporating deslime classifying cyclones to discard the minus 325 mesh fraction followed by column flotation to upgrade the nominal 100- x 325-mesh cyclone underflow.
More recently the pump has been used with a great deal of success in thickener underflow applications.
The remaining difficulties in such evaluations are that overflow or underflow might occur.
Possibly w (i) / W may underflow for some i, but this is ordinarily irrelevant if the computations are properly arranged.
In the streaming-based content sharing services, more bandwidth is required to relay streaming service and the client may suffer from interruption of video playback due to buffer underflow [4].
A typical hydraulic slurry from a base metals mining operation is generated from cyclone underflow (same fraction used in underground sandfill or raising tailings dams).
During some of the underflows, visibility dropped nearly to zero, Johnson and his colleagues report in the November GEOLOGY.
The buffer should be properly dimensioned so that the video play is continuous without underflows at the client's buffer due to the reduction of available bandwidth by network congestion.
50% solids underflows were achieved regularly thereafter.