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Re: What is the difference between a corner case and edge case?

by scain (Curate)
on Jan 13, 2003 at 13:36 UTC ( #226451=note: print w/replies, xml ) Need Help??

in reply to What is the difference between a corner case and edge case?

I believe it comes from numerical methods, specifically for solving multidimentional differential equations. In order to solve a 2D differential equation, you need initial conditions at the boundaries; along the sides, you have one condition that must be met. At the corners, you have two conditions that must met, and frequently, that is where the problems happen.

Minor update: I should more properly have referred to those conditions as boundary conditions, that have to true all the time. In order to solve a 2d differential equation, you also need initial conditions describing the state of the surface initially (at t=0).

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[atcroft]: .oO(Then there is the effect if a site changes their timezone, such as when the International Date Line was moved by the purchase of Alaska by the US from Russia in 1867, or several places (I cannot recall off-hand) that moved from one side of the Date
[atcroft]: Line to the other recently....)
[atcroft]: .oO(Then again, you also have to be careful if you had it to the database, and be aware of any assumptions it makes (such as SQLite assuming Gregorian calendar and a day of exactly 86400 seconds)...)

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