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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; Data frames in the R programming language; Frame (networking)

  3. Missing data - Wikipedia

    en.wikipedia.org/wiki/Missing_data

    In statistics, missing data, or missing values, occur when no data value is stored for the variable in an observation.Missing data are a common occurrence and can have a significant effect on the conclusions that can be drawn from the data.

  4. NaN - Wikipedia

    en.wikipedia.org/wiki/NaN

    In computing, NaN (/ n æ n /), standing for Not a Number, is a particular value of a numeric data type (often a floating-point number) which is undefined as a number, such as the result of 0/0. Systematic use of NaNs was introduced by the IEEE 754 floating-point standard in 1985, along with the representation of other non-finite quantities ...

  5. Gaussian elimination - Wikipedia

    en.wikipedia.org/wiki/Gaussian_elimination

    The process of row reduction makes use of elementary row operations, and can be divided into two parts.The first part (sometimes called forward elimination) reduces a given system to row echelon form, from which one can tell whether there are no solutions, a unique solution, or infinitely many solutions.

  6. Ryan O'Nan - Wikipedia

    en.wikipedia.org/wiki/Ryan_O'Nan

    In 2009, O'Nan had a recurring role on the crime drama series The Unusuals. [1] In 2010, he starred in the drama film The Dry Land. [2] He also had a role as Jared Hale in the pilot episode of the FX series, Justified. In 2011, he wrote, directed, and starred in the comedy film The Brooklyn Brothers Beat the Best. [3]

  7. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

  8. The Nan Movie - Wikipedia

    en.wikipedia.org/wiki/The_Nan_Movie

    The Nan Movie is a 2022 British comedy film written by Catherine Tate and Brett Goldstein and directed by Josie Rourke (uncredited). [1] The film stars Tate and Mathew Horne.It is based on the television series, Catherine Tate's Nan, which is a set of four specials that were broadcast between 2009 and 2015, and itself is a spin-off of the television sketch series, The Catherine Tate Show (2004 ...

  9. Short-time Fourier transform - Wikipedia

    en.wikipedia.org/wiki/Short-time_Fourier_transform

    Simply, in the continuous-time case, the function to be transformed is multiplied by a window function which is nonzero for only a short period of time. The Fourier transform (a one-dimensional function) of the resulting signal is taken, then the window is slid along the time axis until the end resulting in a two-dimensional representation of the signal.