Delaunay triangulation definition
<mathematics, graphics> (After B. Delaunay) For a set S of
points in the Euclidean plane, the unique triangulation
DT(S) of S such that no point in S is inside the circumcircle
of any triangle in DT(S). DT(S) is the dual of the voronoi
diagram of S.
Nearby terms:
degrees of freedom « dehose « DEK « Delaunay triangulation » delayed control-transfer » delay instruction » delay slot
delayed control-transfer definition
<SPARC, programming> A technique used on the SPARC to reduce
the effect of pipeline breaks by executing the instruction
after a branch instruction (the "delay instruction" in the
"delay slot"). If there is no useful instruction which can be
placed in the delay slot then the "annul bit" on the control
transfer instruction can be set, preventing execution of the
delay instruction (unless the control transfer is conditional
and is taken).
Annulled branches are indicated in SPARC assembler language by
appending ",A" to the operation code. For example,
LOOP: ...
CMP %L0,10
BLE,A LOOP
ADD %L2, %L3, #L4
If the delay instruction is also a control transfer
instruction then it gets more complicated. Both control
transfer instructions are executed (but not the following
instruction) and, assuming they are both taken, control is
transferred briefly to the destination of the first and then
immediately to the destination of the second.
(2001-06-26)
Nearby terms:
dehose « DEK « Delaunay triangulation « delayed control-transfer » delay instruction » delay slot » delete
delay instruction definition
delayed control-transfer
Nearby terms:
DEK « Delaunay triangulation « delayed control-transfer « delay instruction » delay slot » delete » delimiter
delay slot definition
delayed control-transfer
Nearby terms:
Delaunay triangulation « delayed control-transfer « delay instruction « delay slot » delete » delimiter » delint
delete definition
1. <operating system> (Or "erase") To make a file
inaccessible.
Usually this operation only deletes information from the
tables the file system uses to locate named files; the
file's contents still exist on disk and can sometimes be
recovered by scanning the whole disk for strings which are
known to have been in the file. Files created subsequently on
the same disk are quite likely to reuse the same blocks and
thus overwrite the deleted file's data permanently.
2. <character> The control character with ASCII code 127.
Usually entering this character from the keyboard deletes the
last character typed from the input buffer. Sadly there is
great confusion between operating systems and keyboard
manufacturers as to whether this function should be assigned
to the delete or backspace key/character.
The choice of code 127 (binary 1111111) is not arbitrary but
dates back to the use of paper tape for input. The delete
key rewound the tape by one character and punched out all
seven holes, thus obliterating whatever character was there
before. The tape reading software ignored any delete
characters in the input.
(1996-12-01)
Nearby terms:
delayed control-transfer « delay instruction « delay slot « delete » delimiter » delint » Delirium
delimiter definition
<character> A character or string used to separate, or
mark the start and end of, items of data in, e.g., a
database, source code, or text file.
See also: record.
(2001-03-16)
Nearby terms:
delay instruction « delay slot « delete « delimiter » delint » Delirium » Delivered Source Instruction
delint definition
/dee-lint/ To modify code to remove problems detected when
linting. Confusingly, this process is also referred to as
"linting" code.
[Jargon File]
Nearby terms:
delay slot « delete « delimiter « delint » Delirium » Delivered Source Instruction » Dell Computer Corporation
Delirium definition
An embedding coordinate language for parallel programming,
implemented on Sequent Symmetry, Cray, BBN Butterfly.
["Parallel Programming with Coordination Structures", S. Lucco
et al, 18th POPL, pp.197-208 (1991)].
Nearby terms:
delete « delimiter « delint « Delirium » Delivered Source Instruction » Dell Computer Corporation » Delphi
Delivered Source Instruction definition
<programming, unit> (DSI) One line of source code (LOC)
developed by a project.
DSI is the primary input to many tools for estimating software
cost. The term "delivered" is generally meant to exclude
non-delivered support software such as test drivers. However,
if these are developed with the same care as delivered
software, with their own reviews, test plans, documentation,
etc., then they should be counted. The "source instructions"
include all program instructions created by project personnel
and processed into machine code by some combination of
preprocessors, compilers, and assemblers. It excludes
comments and unmodified utility software. It includes job
control language, format statements, and data declarations.
(1996-05-29)
Nearby terms:
delimiter « delint « Delirium « Delivered Source Instruction » Dell Computer Corporation » Delphi » Delphi Technique
Dell Computer Corporation definition
<company> One of the biggest US manufacturers of IBM PC
compatibles.
"From notebooks to networks", their slogan says.
Home.
(1996-05-29)
Nearby terms:
delint « Delirium « Delivered Source Instruction « Dell Computer Corporation » Delphi » Delphi Technique » Delta
Delphi definition
1. <company, communications> A US Internet service provider.
[Addresses?]
(1995-04-06)
2. <language> Borland's Object Oriented Pascal (OOPascal)
Rapid Application Development package for Microsoft
Windows. Delphi combines visual, component-based design with
an optimising native code compiler and scalable database
access.
(1996-05-27)
Nearby terms:
Delirium « Delivered Source Instruction « Dell Computer Corporation « Delphi » Delphi Technique » Delta » delta
Delphi Technique definition
<programming, tool> A group forecasting technique, generally
used for future events such as technological developments,
that uses estimates from experts and feedback summaries of
these estimates for additional estimates by these experts
until reasonable consensus occurs. It has been used in
various software cost-estimating activities, including
estimation of factors influencing software costs.
(1996-05-29)
Nearby terms:
Delivered Source Instruction « Dell Computer Corporation « Delphi « Delphi Technique » Delta » delta » Delta-4
Delta definition
<language>
1. An expression-based language developed by J.C. Cleaveland
in 1978.
2. A string-processing language with single-character commands
from Tandem Computers.
3. A language for system specification of simulation
execution.
["System Description and the DELTA Language",
E. Holback-Hansen et al, DELTA Proj Rep 4, Norweg Comput Ctr,
Feb 1977].
4. A COBOL generating language produced by Delta Software
Entwicklung GmbH.
(2000-08-02)
Nearby terms:
Dell Computer Corporation « Delphi « Delphi Technique « Delta » delta » Delta-4 » delta conversion
delta definition
1. A quantitative change, especially a small or incremental
one (this use is general in physics and engineering). "I just
doubled the speed of my program!" "What was the delta on
program size?" "About 30 percent." (He doubled the speed of
his program, but increased its size by only 30 percent.)
2. [Unix] A diff, especially a diff stored under the set
of version-control tools called SCCS (Source Code Control
System) or RCS (Revision Control System). See change
management.
3. A small quantity, but not as small as epsilon. The
jargon usage of delta and epsilon stems from the
traditional use of these letters in mathematics for very small
numerical quantities, particularly in "epsilon-delta" proofs
in limit theory (as in the differential calculus). The term
delta is often used, once epsilon has been mentioned, to
mean a quantity that is slightly bigger than epsilon but
still very small. "The cost isn't epsilon, but it's delta"
means that the cost isn't totally negligible, but it is
nevertheless very small. Common constructions include "within
delta of ---", "within epsilon of ---": that is, "close to"
and "even closer to".
[Jargon File]
(2000-08-02)
Nearby terms:
Delphi « Delphi Technique « Delta « delta » Delta-4 » delta conversion » Delta-Prolog
Delta-4 definition
Definition and Design of an open Dependable Distributed system
architecture. An Esprit project investigating the achievement
of dependability in open distributed systems, including
real-time systems.
Nearby terms:
Delphi Technique « Delta « delta « Delta-4 » delta conversion » Delta-Prolog » delta reduction
delta conversion definition
delta reduction
Nearby terms:
Delta « delta « Delta-4 « delta conversion » Delta-Prolog » delta reduction » DELTASE
Delta-Prolog definition
A Prolog extension with AND-parallelism, don't-know
nondeterminism and interprocess communication using
synchronous event goals and distributed backtracking.
["Delta-Prolog: A Distributed Logic Programming Language",
L.M. Pereira et al, Intl Conf 5th Gen Comp Sys, Nov 1984].
Nearby terms:
delta « Delta-4 « delta conversion « Delta-Prolog » delta reduction » DELTASE » demand driven
delta reduction definition
<theory> In lambda-calculus extended with constants, delta
reduction replaces a function applied to the required number
of arguments (a redex) by a result. E.g. plus 2 3 --> 5.
In contrast with beta reduction (the only kind of reduction
in the pure lambda-calculus) the result is not formed simply
by textual substitution of arguments into the body of a
function. Instead, a delta redex is matched against the left
hand side of all delta rules and is replaced by the right hand
side of the (first) matching rule. There is notionally one
delta rule for each possible combination of function and
arguments. Where this implies an infinite number of rules,
the result is usually defined by reference to some external
system such as mathematical addition or the hardware
operations of some computer. For other types, all rules can
be given explicitly, for example Boolean negation:
not True = False
not False = True
(1997-02-20)
Nearby terms:
Delta-4 « delta conversion « Delta-Prolog « delta reduction » DELTASE » demand driven » demand paged
DELTASE definition
A distributed processing environment concerned with
fault-tolerant and process-control applications from the
Esprit Delta-4 project.
Nearby terms:
delta conversion « Delta-Prolog « delta reduction « DELTASE » demand driven » demand paged » demand paging
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