Ill-behaved: Adj. 1. [numerical Analysis] Said Of An Algorithm Or Computational Method That Tends To Blow Up Because Of Accumulated Roundoff Error Or Poor Convergence Properties.

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:ill-behaved: adj. 1. [numerical analysis] Said of an algorithm or
computational method that tends to blow up because of accumulated
roundoff error or poor convergence properties. 2. Software that
bypasses the defined {OS} interfaces to do things (like screen,
keyboard, and disk I/O) itself, often in a way that depends on the
hardware of the machine it is running on or which is nonportable or
incompatible with other pieces of software. In the IBM PC/MS-DOS
world, there is a folk theorem (nearly true) to the effect that
(owing to gross inadequacies and performance penalties in the OS
interface) all interesting applications are ill-behaved. See also
{bare metal}. Oppose {well-behaved}, compare {PC-ism}. See
{mess-dos}.
-- The AI Hackers Dictionary

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