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  2. Inverted index - Wikipedia

    en.wikipedia.org/wiki/Inverted_index

    The purpose of an inverted index is to allow fast full-text searches, at a cost of increased processing when a document is added to the database. [2] The inverted file may be the database file itself, rather than its index. It is the most popular data structure used in document retrieval systems, [3] used on a large scale for example in search ...

  3. Index notation - Wikipedia

    en.wikipedia.org/wiki/Index_notation

    The second method is used when the number of elements in each row is the same and known at the time the program is written. The programmer declares the array to have, say, three columns by writing e.g. elementtype tablename[][3];. One then refers to a particular element of the array by writing tablename[first index][second index]. The compiler ...

  4. R (programming language) - Wikipedia

    en.wikipedia.org/wiki/R_(programming_language)

    R is a programming language for statistical computing and data visualization.It has been adopted in the fields of data mining, bioinformatics and data analysis. [9]The core R language is augmented by a large number of extension packages, containing reusable code, documentation, and sample data.

  5. Machine learning - Wikipedia

    en.wikipedia.org/wiki/Machine_learning

    In the mathematical model, each training example is represented by an array or vector, sometimes called a feature vector, and the training data is represented by a matrix. Through iterative optimization of an objective function , supervised learning algorithms learn a function that can be used to predict the output associated with new inputs ...

  6. Tokyo - Wikipedia

    en.wikipedia.org/wiki/Tokyo

    Tokyo is home to a wide array of museums, art galleries, and libraries, catering to various interests. Ueno Park has the Tokyo National Museum , the country's largest museum specializing in traditional Japanese art, [ 213 ] the National Museum of Western Art , whose building designed by Le Corbusier is a world heritage site , [ 214 ] and the ...

  7. Of Pandas and People - Wikipedia

    en.wikipedia.org/wiki/Of_Pandas_and_People

    Of Pandas and People: The Central Question of Biological Origins is a controversial 1989 (2nd edition 1993) school-level supplementary textbook written by Percival Davis and Dean H. Kenyon, edited by Charles Thaxton and published by the Texas-based Foundation for Thought and Ethics (FTE).

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    open text file in pandas array index of two values example in excel spreadsheet