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Thread: Grid Distances

  1. February 19th 2010, 01:22 PM #1
    Mystery
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    Grid Distances

    Given a basic X & Y grid what is the formula to determine distance between two grid items?
    I.E
    First item is at grid 5, 6 second grid item is at 7, 8.
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  2. February 19th 2010, 01:35 PM #2
    e^(i*pi)
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    Quote Originally Posted by Mystery View Post
    Given a basic X & Y grid what is the formula to determine distance between two grid items?
    I.E
    First item is at grid 5, 6 second grid item is at 7, 8.
    It's a form of Pythagoras' Theorem.

    For two points (x_1, y_1) and (x_2,y_2) the distance between them (d) is given by:

    d = \sqrt{(y_2-y_1)^2 + (x_2-x_1)^2}
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  3. February 19th 2010, 02:29 PM #3
    Plato
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    Quote Originally Posted by Mystery View Post
    Given a basic X & Y grid what is the formula to determine distance between two grid items?
    First item is at grid 5, 6 second grid item is at 7, 8.
    No it is not a form of Pythagoras' Theorem.
    It is the grid-metric or the 'taxicab' metric.
    If P(x_1,y_1)~\&~Q(x_2,y_2) then the grid-metric is d(P,Q)=\left| {x_1 - x_2 } \right| + \left| {y_1 - y_2 } \right|
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  4. February 20th 2010, 11:53 AM #4
    shayan603
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    what kind of grid is it?
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