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  2. Naval Observatory Vector Astrometry Subroutines - Wikipedia

    en.wikipedia.org/wiki/Naval_Observatory_Vector...

    The Python edition allows calling the NOVAS functions from Python. It is mostly feature complete with respect to the C edition, with a few exceptions, [ 4 ] and shares the C edition's API. The current edition uses Python's foreign function library, ctypes.

  3. List of free and open-source software packages - Wikipedia

    en.wikipedia.org/wiki/List_of_free_and_open...

    Gnumeric – spreadsheet program of the GNOME Project; Calligra Sheets – spreadsheet component of the Calligra Suite in KDE; Pyspread – spreadsheet which uses Python for macro programming, and allows each cell to contain data, the results of a calculation, a Python program, or the results of a Python program.

  4. Rainbow table - Wikipedia

    en.wikipedia.org/wiki/Rainbow_table

    In the simple case where the reduction function and the hash function have no collision, given a complete rainbow table (one that makes sure to find the corresponding password given any hash) the size of the password set |P|, the time T that had been needed to compute the table, the length of the table L and the average time t needed to find a ...

  5. Sample entropy - Wikipedia

    en.wikipedia.org/wiki/Sample_entropy

    Like approximate entropy (ApEn), Sample entropy (SampEn) is a measure of complexity. [1] But it does not include self-similar patterns as ApEn does. For a given embedding dimension, tolerance and number of data points, SampEn is the negative natural logarithm of the probability that if two sets of simultaneous data points of length have distance < then two sets of simultaneous data points of ...

  6. How Do I Calculate the Net Present Value (NPV) on ... - AOL

    www.aol.com/finance/calculate-net-present-value...

    The easiest way to calculate the net present value of an investment is using an online NPV calculator. You can also make these calculations in Excel. You can also make these calculations in Excel.

  7. Algorithms for calculating variance - Wikipedia

    en.wikipedia.org/wiki/Algorithms_for_calculating...

    This algorithm can easily be adapted to compute the variance of a finite population: simply divide by n instead of n − 1 on the last line.. Because SumSq and (Sum×Sum)/n can be very similar numbers, cancellation can lead to the precision of the result to be much less than the inherent precision of the floating-point arithmetic used to perform the computation.

  8. Hash tree (persistent data structure) - Wikipedia

    en.wikipedia.org/wiki/Hash_tree_(persistent_data...

    In computer science, a hash tree (or hash trie) is a persistent data structure that can be used to implement sets and maps, intended to replace hash tables in purely functional programming. In its basic form, a hash tree stores the hashes of its keys, regarded as strings of bits, in a trie, with the actual keys and (optional) values stored at ...

  9. Fuzzy pay-off method for real option valuation - Wikipedia

    en.wikipedia.org/wiki/Fuzzy_Pay-Off_Method_for...

    The structure of the method is similar to the probability theory based Datar–Mathews method for real option valuation, [2] [3] but the method is not based on probability theory and uses fuzzy numbers and possibility theory in framing the real option valuation problem.