J is for jump discontinuity.
Here is a picture of a nice, smooth continuous function:
Image courtesy: Wikicommons
Compare that unbroken, blue swoop to this choppy, blue step function, which hops up at every number leaving a gap. Such a break is called a jump discontinuity.
Image courtesy: Wikimedia Commons
This particular step function is called a floor function. We've got two axes here: the horizontal x-axis and the vertical y-axis. Where x = 0, you see a solid blue dot. That means y = 0 there too. Where x = 0.5, y still equals 0. Where x = 0.9, y is still 0, and so on until you get to x = 1. Then the y value jumps up to 1 too.
Similarly, when x = 1.2 or 1.4 or 1.8 or 1.99999, the corresponding y is 1. Then when x = 2, y jumps from 1 up to 2.
What kind of kooky person uses something like this? You do, every time someone asks your age.
I never knew this had a term. Teachers don't teach that in school.
ReplyDelete???
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ReplyDeleteTotally lost, Think I might have seen a graph like that back in school, but lordy that was sooooooooooo long ago, back in the dark ages I don't remember a thing about it.
ReplyDeleteStep functions are quite useful for some purposes in theoretical physics, in particular the single-step function known as the Heaviside function (the function in your plot can be represented as a sum of Heaviside functions) >:)
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This was fun! I wish I had you for a math teacher! I'm your newest follower!
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