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  2. pandas (software) - Wikipedia

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

    Pandas supports hierarchical indices with multiple values per data point. An index with this structure, called a "MultiIndex", allows a single DataFrame to represent multiple dimensions, similar to a pivot table in Microsoft Excel. [4]: 147–148 Each level of a MultiIndex can be given a unique name.

  3. Multi-index notation - Wikipedia

    en.wikipedia.org/wiki/Multi-index_notation

    Note that, since x + y is a vector and α is a multi-index, the expression on the left is short for (x 1 + y 1) α 1 ⋯(x n + y n) α n. Leibniz formula For smooth functions f {\textstyle f} and g {\textstyle g} , ∂ α ( f g ) = ∑ ν ≤ α ( α ν ) ∂ ν f ∂ α − ν g . {\displaystyle \partial ^{\alpha }(fg)=\sum _{\nu \leq \alpha ...

  4. Index mapping - Wikipedia

    en.wikipedia.org/wiki/Index_mapping

    Index mapping (or direct addressing, or a trivial hash function) in computer science describes using an array, in which each position corresponds to a key in the universe of possible values. [1] The technique is most effective when the universe of keys is reasonably small, such that allocating an array with one position for every possible key ...

  5. Explainer-Who are the immigrants who could be targeted in ...

    www.aol.com/news/explainer-immigrants-could...

    President-elect Donald Trump plans to launch a mass deportation operation targeting millions of immigrants living in the U.S. illegally and with temporary protections once he takes office on Jan ...

  6. Index notation - Wikipedia

    en.wikipedia.org/wiki/Index_notation

    The compiler computes the total number of memory cells occupied by each row, uses the first index to find the address of the desired row, and then uses the second index to find the address of the desired element in the row. When the third method is used, the programmer declares the table to be an array of pointers, like in elementtype ...

  7. Walmart employees testing body cameras at some stores for ...

    www.aol.com/walmart-employees-testing-body...

    Walmart said it is testing employees wearing body cameras in one U.S. market in a "handful of stores" as a way to protect its employees.

  8. Trump tariffs on Canada imports could bring sharply higher ...

    www.aol.com/trump-tariffs-canada-imports-could...

    Donald Trump's proposed tariffs on Canada could increase U.S. gas prices by up to 70 cents a gallon, energy experts say.

  9. Database index - Wikipedia

    en.wikipedia.org/wiki/Database_index

    A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table every time said table is accessed.