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  2. Wide and narrow data - Wikipedia

    en.wikipedia.org/wiki/Wide_and_narrow_data

    The pandas package in Python implements this operation as "melt" function which converts a wide table to a narrow one. The process of converting a narrow table to wide table is generally referred to as "pivoting" in the context of data transformations.

  3. Comma-separated values - Wikipedia

    en.wikipedia.org/wiki/Comma-separated_values

    Comma-separated values (CSV) is a text file format that uses commas to separate values, and newlines to separate records. A CSV file stores tabular data (numbers and text) in plain text, where each line of the file typically represents one data record.

  4. Help:Advanced table formatting - Wikipedia

    en.wikipedia.org/wiki/Help:Advanced_table_formatting

    Instead of trying to make a super-cell that spans rows/columns, split it into smaller cells while leaving some cells intentionally empty. Use a non-breaking space with   or {} in empty cells to maintain the table structure. Custom CSS styling: Override the wikitable class defaults by explicitly specifying: border-collapse: collapse;

  5. Comparison of programming languages (string functions)

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

    String functions are used in computer programming languages to manipulate a string or query information about a string (some do both).. Most programming languages that have a string datatype will have some string functions although there may be other low-level ways within each language to handle strings directly.

  6. Help:Table - Wikipedia

    en.wikipedia.org/wiki/Help:Table

    easily adding a new column if many elements of the new column are left blank (if the column is inserted and the existing fields are unnamed, use a named parameter for the new field to avoid adding blank parameter values to many template calls) computing fields from other fields, e.g. population density from population and area

  7. B-tree - Wikipedia

    en.wikipedia.org/wiki/B-tree

    To maintain the predefined range of child nodes, internal nodes may be joined or split. Usually, the number of keys is chosen to vary between d {\displaystyle d} and 2 d {\displaystyle 2d} , where d {\displaystyle d} is the minimum number of keys, and d + 1 {\displaystyle d+1} is the minimum degree or branching factor of the tree.

  8. Template:Div col - Wikipedia

    en.wikipedia.org/wiki/Template:Div_col

    Breaks a list into columns. It automatically breaks each column to an equal space, so you do not manually have to find the half way point on two columns. The list is provided by |content= or closed with {{div col end}}. Template parameters [Edit template data] Parameter Description Type Status Column width colwidth Specifies the width of columns, and determines dynamically the number of ...

  9. Template:String split - Wikipedia

    en.wikipedia.org/wiki/Template:String_split

    {{String split |txt=This is a piece of text to be split |sep=" " |idx=-1}} → split; An easy mistake to make when using negative parameters is to forget that a trailing space in the text when passed as an unnamed parameter will induce an empty last chunk: {{String split |This is a piece of text to be split |" "|-1}} → {{String split |This is ...