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  2. Listwise deletion - Wikipedia

    en.wikipedia.org/wiki/Listwise_deletion

    A visual example of list wise deletion. In statistics, listwise deletion is a method for handling missing data. In this method, an entire record is excluded from analysis if any single value is missing. [1]: 6

  3. Data Matrix - Wikipedia

    en.wikipedia.org/wiki/Data_Matrix

    A Data Matrix on a Mini PCI card, encoding the serial number 15C06E115AZC72983004. The most popular application for Data Matrix is marking small items, due to the code's ability to encode fifty characters in a symbol that is readable at 2 or 3 mm 2 (0.003 or 0.005 sq in) and the fact that the code can be read with only a 20% contrast ratio. [1]

  4. R-tree - Wikipedia

    en.wikipedia.org/wiki/R-tree

    A common real-world usage for an R-tree might be to store spatial objects such as restaurant locations or the polygons that typical maps are made of: streets, buildings, outlines of lakes, coastlines, etc. and then find answers quickly to queries such as "Find all museums within 2 km of my current location", "retrieve all road segments within 2 ...

  5. Function of several real variables - Wikipedia

    en.wikipedia.org/wiki/Function_of_several_real...

    The image of a function f(x 1, x 2, …, x n) is the set of all values of f when the n-tuple (x 1, x 2, …, x n) runs in the whole domain of f.For a continuous (see below for a definition) real-valued function which has a connected domain, the image is either an interval or a single value.

  6. Flood fill - Wikipedia

    en.wikipedia.org/wiki/Flood_fill

    Flood fill, also called seed fill, is a flooding algorithm that determines and alters the area connected to a given node in a multi-dimensional array with some matching attribute. It is used in the "bucket" fill tool of paint programs to fill connected, similarly colored areas with a different color, and in games such as Go and Minesweeper for ...

  7. Euclidean vector - Wikipedia

    en.wikipedia.org/wiki/Euclidean_vector

    If you change units (a special case of a change of basis) from meters to millimeters, a scale factor of 1/1000, a displacement of 1 m becomes 1000 mm—a contravariant change in numerical value. In contrast, a gradient of 1 K /m becomes 0.001 K/mm—a covariant change in value (for more, see covariance and contravariance of vectors ).

  8. Sweep line algorithm - Wikipedia

    en.wikipedia.org/wiki/Sweep_line_algorithm

    The idea behind algorithms of this type is to imagine that a line (often a vertical line) is swept or moved across the plane, stopping at some points. Geometric operations are restricted to geometric objects that either intersect or are in the immediate vicinity of the sweep line whenever it stops, and the complete solution is available once ...

  9. Turnstile (symbol) - Wikipedia

    en.wikipedia.org/wiki/Turnstile_(symbol)

    The symbol is also supported (at code point 148) in a modified variant of the HP Roman-8 character set used by other HP calculators. On the Casio fx-92 Collège 2D and fx-92+ Spéciale Collège calculators, [ 13 ] the symbol represents the modulo operator; entering 5 ⊢ 2 {\displaystyle 5\vdash 2} will produce an answer of Q = 2 ; R = 1 ...