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  2. Dataframe - Wikipedia

    en.wikipedia.org/wiki/Dataframe

    Dataframe may refer to: A tabular data structure common to many data processing libraries: pandas (software) § DataFrames; The Dataframe API in Apache Spark;

  3. NaN - Wikipedia

    en.wikipedia.org/wiki/NaN

    NaN% NAN (C, C++, Rust) NaNQ (IBM XL and AIX: Fortran, C++ proposal n2290) NaNS (ditto) qNaN sNaN 1.#SNAN (Excel) 1.#QNAN (Excel) -1.#IND (Excel) +nan.0 (Scheme) Since, in practice, encoded NaNs have a sign, a quiet/signaling bit and optional 'diagnostic information' (sometimes called a payload ), these will occasionally be found in string ...

  4. Aggregate function - Wikipedia

    en.wikipedia.org/wiki/Aggregate_function

    Nanmean (mean ignoring NaN values, also known as "nil" or "null") Stddev; Formally, an aggregate function takes as input a set, a multiset (bag), or a list from some input domain I and outputs an element of an output domain O. [1] The input and output domains may be the same, such as for SUM, or may be different, such as for COUNT.

  5. Gaussian elimination - Wikipedia

    en.wikipedia.org/wiki/Gaussian_elimination

    Animation of Gaussian elimination. Red row eliminates the following rows, green rows change their order. In mathematics, Gaussian elimination, also known as row reduction, is an algorithm for solving systems of linear equations. It consists of a sequence of row-wise operations performed on the corresponding matrix of coefficients.

  6. How will national championship play out? Two key coaches ...

    www.aol.com/sports/national-championship-play...

    The Irish are one of the best units in the country against the pass. And Ohio State has more offensive weapons than just about any other team.

  7. Edit distance - Wikipedia

    en.wikipedia.org/wiki/Edit_distance

    Edit distance finds applications in computational biology and natural language processing, e.g. the correction of spelling mistakes or OCR errors, and approximate string matching, where the objective is to find matches for short strings in many longer texts, in situations where a small number of differences is to be expected.

  8. C++ string handling - Wikipedia

    en.wikipedia.org/wiki/C++_string_handling

    The std::string class is the standard representation for a text string since C++98. The class provides some typical string operations like comparison, concatenation, find and replace, and a function for obtaining substrings. An std::string can be constructed from a C-style string, and a C-style string can also be obtained from one. [7]

  9. String operations - Wikipedia

    en.wikipedia.org/wiki/String_operations

    A string homomorphism (often referred to simply as a homomorphism in formal language theory) is a string substitution such that each character is replaced by a single string. That is, f ( a ) = s {\displaystyle f(a)=s} , where s {\displaystyle s} is a string, for each character a {\displaystyle a} .