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  2. 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.

  3. 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)

  4. Row and column vectors - Wikipedia

    en.wikipedia.org/wiki/Row_and_column_vectors

    The transpose (indicated by T) of any row vector is a column vector, and the transpose of any column vector is a row vector: […] = [] and [] = […]. The set of all row vectors with n entries in a given field (such as the real numbers ) forms an n -dimensional vector space ; similarly, the set of all column vectors with m entries forms an m ...

  5. Append - Wikipedia

    en.wikipedia.org/wiki/Append

    2.5 Python. 2.6 Bash. ... append is the operation for concatenating linked lists or arrays in some high-level programming ... one should always check the return value.

  6. Array slicing - Wikipedia

    en.wikipedia.org/wiki/Array_slicing

    This feature can be used, for example, to extract one-dimensional slices (vectors: in 3D, rows, columns, and tubes [1]) or two-dimensional slices (rectangular matrices) from a three-dimensional array. However, since the range can be specified at run-time, type-checked languages may require an explicit (compile-time) notation to actually ...

  7. The Dow just did something it hasn’t done since Jimmy ... - AOL

    www.aol.com/dow-danger-doing-something-hasn...

    The world’s most famous market indicator just suffered its longest losing streak since Jimmy Carter was in the White House. The Dow Jones Industrial Average closed lower by 267 points on Tuesday ...

  8. Is It Just Stress...Or Perimenopause? Doctors Explain ... - AOL

    www.aol.com/just-stress-perimenopause-doctors...

    One is the life stage during which perimenopause typically occurs, says Dr. Rosser. “We have aging parents. We have growing children, if we decided to have children. We have our relationships.

  9. Data structure - Wikipedia

    en.wikipedia.org/wiki/Data_structure

    A data structure known as a hash table.. In computer science, a data structure is a data organization and storage format that is usually chosen for efficient access to data. [1] [2] [3] More precisely, a data structure is a collection of data values, the relationships among them, and the functions or operations that can be applied to the data, [4] i.e., it is an algebraic structure about data.