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  2. Comparison of programming languages (associative array)

    en.wikipedia.org/wiki/Comparison_of_programming...

    The arrays are heterogeneous: a single array can have keys of different types. PHP's associative arrays can be used to represent trees, lists, stacks, queues, and other common data structures not built into PHP. An associative array can be declared using the following syntax:

  3. Comma-separated values - Wikipedia

    en.wikipedia.org/wiki/Comma-separated_values

    An optional header record (there is no sure way to detect whether it is present, so care is required when importing). Each record should contain the same number of comma-separated fields. Any field may be quoted (with double quotes). Fields containing a line-break, double-quote or commas should be quoted. (If they are not, the file will likely ...

  4. Array (data type) - Wikipedia

    en.wikipedia.org/wiki/Array_(data_type)

    Array data types are most often implemented as array structures: with the indices restricted to integer (or totally ordered) values, index ranges fixed at array creation time, and multilinear element addressing. This was the case in most "third generation" languages, and is still the case of most systems programming languages such as Ada, C ...

  5. Associative array - Wikipedia

    en.wikipedia.org/wiki/Associative_array

    In computer science, an associative array, map, symbol table, or dictionary is an abstract data type that stores a collection of (key, value) pairs, such that each possible key appears at most once in the collection. In mathematical terms, an associative array is a function with finite domain. [1] It supports 'lookup', 'remove', and 'insert ...

  6. Pivot table - Wikipedia

    en.wikipedia.org/wiki/Pivot_table

    The fields that would be created will be visible on the right hand side of the worksheet. By default, the pivot table layout design will appear below this list. Pivot Table fields are the building blocks of pivot tables. Each of the fields from the list can be dragged on to this layout, which has four options: Filters; Columns; Rows; Values

  7. Append - Wikipedia

    en.wikipedia.org/wiki/Append

    Following Lisp, other high-level programming languages which feature linked lists as primitive data structures have adopted an append. To append lists, as an operator, Haskell uses ++, OCaml uses @. Other languages use the + or ++ symbols to nondestructively concatenate a string, list, or array.

  8. NetCDF - Wikipedia

    en.wikipedia.org/wiki/NetCDF

    The Python programming language can access netCDF files with the PyNIO [14] module (which also facilitates access to a variety of other data formats). netCDF files can also be read with the Python module netCDF4-python, [15] and into a pandas-like DataFrame with the xarray module. [16]

  9. Append-only - Wikipedia

    en.wikipedia.org/wiki/Append-only

    Many file systems' Access Control Lists implement an "append-only" permission: chattr in Linux can be used to set the append-only flag to files and directories. This corresponds to the O_APPEND flag in open(). [1] NTFS ACL has a control for "Create Folders / Append Data", but it does not seem to keep data immutable. [2]