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  2. List of common coordinate transformations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_coordinate...

    The value for must be solved for in this manner because for all values of , ⁡ is only defined for < < +, and is periodic (with period ). This means that the inverse function will only give values in the domain of the function, but restricted to a single period.

  3. Del in cylindrical and spherical coordinates - Wikipedia

    en.wikipedia.org/wiki/Del_in_cylindrical_and...

    This article uses the standard notation ISO 80000-2, which supersedes ISO 31-11, for spherical coordinates (other sources may reverse the definitions of θ and φ): . The polar angle is denoted by [,]: it is the angle between the z-axis and the radial vector connecting the origin to the point in question.

  4. Navigational algorithms - Wikipedia

    en.wikipedia.org/wiki/Navigational_Algorithms

    Obtaining the height line Marcq St. Hilaire. The navigational algorithms are the quintessence of the executable software on portable calculators or smartphones as an aid to the art of navigation, this attempt article describe both algorithms and software for smartphones implementing different calculation procedures for navigation.

  5. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    Problems can occur because, for anything but the simplest calculation, in order to work out the value of a written formula, the user of a button-operated calculator is required to: Rearrange the formula so that the value can be calculated by pressing buttons one at a time, while taking operator precedence and parentheses into account.

  6. 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;

  7. Hoda Kotb Shares Holiday Card With Her Daughters Ahead of ...

    www.aol.com/lifestyle/hoda-kotb-shares-holiday...

    Hoda Kotb's fans are really loving her family's holiday card this year — and we can see why!. On the December 9 taping of Today With Hoda and Jenna, the NBC news anchor and her co-star Jenna ...

  8. Spirit Airlines files for bankruptcy following mounting debt ...

    www.aol.com/spirit-airlines-files-bankruptcy...

    Spirit Airlines said Monday it has filed for Chapter 11 bankruptcy protection after struggling with losses, growing debt and a failed merger during the post-pandemic travel lull.

  9. Z-order curve - Wikipedia

    en.wikipedia.org/wiki/Z-order_curve

    The Z-ordering can be used to efficiently build a quadtree (2D) or octree (3D) for a set of points. [4] [5] The basic idea is to sort the input set according to Z-order.Once sorted, the points can either be stored in a binary search tree and used directly, which is called a linear quadtree, [6] or they can be used to build a pointer based quadtree.