underflow


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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 ?
Underflow and overflow samples were taken from the feed while the hydrocyclones were undergoing splash, semi-roping and roping conditions.
Thus, we can conclude that it is not suitable to apply the constant thresholds to the preprocessing against the overflow and underflow, and the flexible thresholds should be adopted to preprocess the images with different histogram distributions.
At the same condition, the higher density phase (FeSi) tends more to move to outer vortex and separate to underflow and the lower density phase (Ca[(OH).
The conditions (3)-(4) guarantee that the relative error in the computed result is at most 1/2 ulp (Unit in the Last Place) of the computed result in round to nearest, and at most 1 ulp of the computed result in the other rounding modes, in the absence of overflow and underflow.
What is new is its coupling with a priori determination of truncation points and a priori underflow checks.
This condition helps in avoiding buffer underflow in case the client overestimates the throughput or there is a sudden drop in the throughput.
The data also indicated very little difference in sulfur contents of the overflow and underflow products for sizes larger than 325 mesh.
Its staff installed two 4-inch air lifts (one in each of its two secondary clarifiers) and approximately 200 feet of 4-inch PVC pipe, with miscellaneous fittings to convey some of each clarifier's underflow to the head of the RBC trains.
18mm screen, the oversize carbon being sent to a kiln for carbon regeneration whilst the underflow, containing grit, slime, fine carbon and water, is directed to a holding tank and then to a filter press.
the appropriate detection of exceptions such as overflow, underflow, and invalid (where relevant for the operation);
symbol(), although there are some extra complications caused by underflow possibilities (see the next subsection).
In order for the vbz to be able to ensure the transport order during the construction phase, all work must be carried out underflow.