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  2. dplyr - Wikipedia

    en.wikipedia.org/wiki/Dplyr

    arrange(), which is used to sort rows in a dataframe based on attributes held by particular columns; mutate(), which is used to create new variables, by altering and/or combining values from existing columns; and; summarize(), also spelled summarise(), which is used to collapse values from a dataframe into a single summary.

  3. pandas (software) - Wikipedia

    en.wikipedia.org/wiki/Pandas_(software)

    [4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.

  4. 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.

  5. Tidyverse - Wikipedia

    en.wikipedia.org/wiki/Tidyverse

    tidyr – help transform data specifically into tidy data, where each variable is a column, each observation is a row; each row is an observation, and each value is a cell. readr – help read in common delimited, text files with data; purrr – a functional programming toolkit; tibble – a modern implementation of the built-in data frame data ...

  6. Star schema - Wikipedia

    en.wikipedia.org/wiki/Star_schema

    The non-primary key Units_Sold column of the fact table in this example represents a measure or metric that can be used in calculations and analysis. The non-primary key columns of the dimension tables represent additional attributes of the dimensions (such as the Year of the Dim_Date dimension).

  7. Drivers targeted in emerging crime trend have one thing in common

    www.aol.com/drivers-targeted-emerging-crime...

    Texas law enforcement issued a word of warning to Ford truck owners after they arrested a trio of thieves who targeted the high-end truck model by stealing taillights.

  8. Watch the World’s Boldest Crab Fend Off Curious Lions

    www.aol.com/watch-world-boldest-crab-fend...

    Watch the Video. Click here to watch on YouTube. Not many creatures on Earth can pull off keeping a pride of curious lions at bay. But lions don’t want to get their soft noses pinched by a crab ...

  9. Design matrix - Wikipedia

    en.wikipedia.org/wiki/Design_matrix

    The design matrix has dimension n-by-p, where n is the number of samples observed, and p is the number of variables measured in all samples. [4] [5]In this representation different rows typically represent different repetitions of an experiment, while columns represent different types of data (say, the results from particular probes).