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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. Row- and column-major order - Wikipedia

    en.wikipedia.org/wiki/Row-_and_column-major_order

    More generally, there are d! possible orders for a given array, one for each permutation of dimensions (with row-major and column-order just 2 special cases), although the lists of stride values are not necessarily permutations of each other, e.g., in the 2-by-3 example above, the strides are (3,1) for row-major and (1,2) for column-major.

  4. 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.

  5. 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;

  6. Polar coordinate system - Wikipedia

    en.wikipedia.org/wiki/Polar_coordinate_system

    The complex number z can be represented in rectangular form as = + where i is the imaginary unit, or can alternatively be written in polar form as = (⁡ + ⁡) and from there, by Euler's formula, [14] as = = ⁡. where e is Euler's number, and φ, expressed in radians, is the principal value of the complex number function arg applied to x + iy ...

  7. He had no family. He was not famous. Yet hundreds attended ...

    www.aol.com/news/had-no-living-family-not...

    He had no living family. He was not famous. He lived alone. Yet on Tuesday, hundreds of people gathered at the graveside of World War II veteran Stephen Kolesnik Jr. and watched him laid to rest.

  8. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    These matrices produce the desired effect only if they are used to premultiply column vectors, and (since in general matrix multiplication is not commutative) only if they are applied in the specified order (see Ambiguities for more details). The order of rotation operations is from right to left; the matrix adjacent to the column vector is the ...

  9. American Airlines rolls out new technology that would crack ...

    www.aol.com/news/american-airlines-testing...

    The technology gives gate agents an audible signal when someone scans their ticket and tries to board early, prompting that passenger to step aside and wait for their correct group to be called.