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[numerical analysis] Said of an algorithm or computational method that tends to blow up because of accumulated roundoff error or poor convergence properties.


Software that bypasses the defined operating system 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/mess-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. Opposite: well-behaved, compare PC-ism.
This article is provided by FOLDOC - Free Online Dictionary of Computing (


Programs that do not deviate from a standard. A program that is not well-behaved (ill-behaved) typically bypasses the operating system or some other control program and accesses the hardware directly in order to improve performance.

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References in periodicals archive ?
Don't overlook the fact that the distortions in children's up-bringing this shift causes are a major factor responsible for children becoming ill-behaved and falling victim to bad habits, especially petty crime.
They fly about, drop number twos on our objets d'art and squeal like ill-behaved children, which is to say all children, the very reason we don't want any, maybe blasphemy to some but we've settled quite comfortably into these conversations.
Ethically driven organizations too bear the brunt due to some of their ill-behaved cousins," said a senior investigator with a transnational CRO.
" I cannot ever recall experiencing the Pavilion at Lord's both as full as it was for the Middlesex v Surrey 20/20 -andso crammed with such predominantly repulsive, ill-behaved apologies for membership of the human race - what for the most part I would regard as The Great Unwashed" - John "Fingers" Fingleton, a stalwart of the MCC for more than 4 0 years.
Fingleton, a charity auctioneer, and others have taken to the MCC's members' online notice board to protest the presence of 'mobs of ill-behaved, ill-dressed screaming yobbos' in the Lord's Pavilion during a domestic Twenty20 game this month.
They faced dangerous situation in the beginning when they first acquired the street life, but later they themselves became troublesome for others depending upon the degree of their socialization with the ill-behaved.
And fuddy-duddies wonder why kids are so ill-behaved and bolshie in the classroom.
But ask most anyone in Europe, especially in one of the Nordic countries, and they'll explain that he's an ill-behaved lad who mended his ways after living to Lapland on the back of a goose.
Brown (Colin Firth) tame his seven exceedingly ill-behaved children.
"From my experience of the park I am at a loss to see what those problems are, beyond the odd (and rare) ill-behaved dog.
and international media, would unlikely be able to help recoup the ailing Aso administration, whose support ratings have hit record lows after its finance minister abruptly resigned last week following his ill-behaved press conference in Rome.
Regarding Mayor Kitty Piercy supporting new rules for the mall area in downtown Eugene: If the ill-behaved are ticketed for things such as drugs, trespassing and menacing, what are the consequences?