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  2. 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;

  3. Linear discriminant analysis - Wikipedia

    en.wikipedia.org/wiki/Linear_discriminant_analysis

    An eigenvalue in discriminant analysis is the characteristic root of each function. [clarification needed] It is an indication of how well that function differentiates the groups, where the larger the eigenvalue, the better the function differentiates. [8] This however, should be interpreted with caution, as eigenvalues have no upper limit.

  4. Distribution (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Distribution_(mathematics)

    This function is a test function on and is an element of (). The support of this function is the closed unit disk in R 2 . {\displaystyle \mathbb {R} ^{2}.} It is non-zero on the open unit disk and it is equal to 0 everywhere outside of it.

  5. Cortical column - Wikipedia

    en.wikipedia.org/wiki/Cortical_column

    With 50 to 100 cortical minicolumns per cortical column a human would have 2–4 million (2×10 6 –4×10 6) cortical columns. There may be more if the columns can overlap, as suggested by Tsunoda et al. [17] Jeff Hawkins claims that there are only 150,000 columns in the human neocortex, based on research made by his company Numenta. [18]

  6. Rijndael MixColumns - Wikipedia

    en.wikipedia.org/wiki/Rijndael_MixColumns

    The MixColumns operation performed by the Rijndael cipher or Advanced Encryption Standard is, along with the ShiftRows step, its primary source of diffusion.. Each column of bytes is treated as a four-term polynomial () = + + +, each byte representing an element in the Galois field ⁡ ().

  7. Column - Wikipedia

    en.wikipedia.org/wiki/Column

    A steel column is extended by welding or bolting splice plates on the flanges and webs or walls of the columns to provide a few inches or feet of load transfer from the upper to the lower column section. A timber column is usually extended by the use of a steel tube or wrapped-around sheet-metal plate bolted onto the two connecting timber sections.