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  2. Lehmer code - Wikipedia

    en.wikipedia.org/wiki/Lehmer_code

    Other properties of the Lehmer code include that the lexicographical order of the encodings of two permutations is the same as that of their sequences (σ 1, ..., σ n), that any value 0 in the code represents a right-to-left minimum in the permutation (i.e., a σ i smaller than any σ j to its right), and a value n − i at position i ...

  3. Skip list - Wikipedia

    en.wikipedia.org/wiki/Skip_list

    A search for a target element begins at the head element in the top list, and proceeds horizontally until the current element is greater than or equal to the target. If the current element is equal to the target, it has been found. If the current element is greater than the target, or the search reaches the end of the linked list, the procedure ...

  4. Nonnegative matrix - Wikipedia

    en.wikipedia.org/wiki/Nonnegative_matrix

    In mathematics, a nonnegative matrix, written , is a matrix in which all the elements are equal to or greater than zero, that is, ,. A positive matrix is a matrix in which all the elements are strictly greater than zero.

  5. Truncated normal distribution - Wikipedia

    en.wikipedia.org/wiki/Truncated_normal_distribution

    Regardless of whether the random variable is bounded above, below, or both, the truncation is a mean-preserving contraction combined with a mean-changing rigid shift, and hence the variance of the truncated distribution is less than the variance of the original normal distribution.

  6. NumPy - Wikipedia

    en.wikipedia.org/wiki/NumPy

    In early 2005, NumPy developer Travis Oliphant wanted to unify the community around a single array package and ported Numarray's features to Numeric, releasing the result as NumPy 1.0 in 2006. [9] This new project was part of SciPy. To avoid installing the large SciPy package just to get an array object, this new package was separated and ...

  7. Positive real numbers - Wikipedia

    en.wikipedia.org/wiki/Positive_real_numbers

    Including 0, the set has a semiring structure (0 being the additive identity), known as the probability semiring; taking logarithms (with a choice of base giving a logarithmic unit) gives an isomorphism with the log semiring (with 0 corresponding to ), and its units (the finite numbers, excluding ) correspond to the positive real numbers.

  8. Spectral radius - Wikipedia

    en.wikipedia.org/wiki/Spectral_radius

    (July 2022) (Learn how and when to remove this message) In mathematics , the spectral radius of a square matrix is the maximum of the absolute values of its eigenvalues . [ 1 ] More generally, the spectral radius of a bounded linear operator is the supremum of the absolute values of the elements of its spectrum .

  9. Jacobi method - Wikipedia

    en.wikipedia.org/wiki/Jacobi_method

    Each diagonal element is solved for, and an approximate value is plugged in. The process is then iterated until it converges. This algorithm is a stripped-down version of the Jacobi transformation method of matrix diagonalization .