How Math.Pow (and so on) actually works

by

pow is usually evaluated by this formula:

x^y = exp2(y*log2(x))

Functions exp2(x),log2(x) are directly implemented in FPU. If you want to implement bignums then they can also be evaluated by basic operators with use of precomputed table of sqrt-powers like:

2^1/2, 2^1/4, 2^1/8, 2^1/16, 2^1/32 ...

to speed up the process

In case you need to handle also rooting for negative bases see this:

More Related Contents:

  1. C# custom add in a List
  2. Best way to reverse a string
  3. Algorithm to detect overlapping periods [duplicate]
  4. How is Math.Pow() implemented in .NET Framework?
  5. Best way to randomize an array with .NET
  6. What guarantees are there on the run-time complexity (Big-O) of LINQ methods?
  7. C# Point in polygon
  8. Algorithm for simplifying decimal to fractions
  9. Remove text in-between delimiters in a string (using a regex?)
  10. Nice & universal way to convert List of items to Tree
  11. Split String into smaller Strings by length variable
  12. Compare string similarity
  13. Calculate median in c#
  14. C#: Seeking PNG Compression algorithm/library [closed]
  15. How can I tell if a point belongs to a certain line?
  16. Creating a power set of a Sequence
  17. All cases covered Bresenham’s line-algorithm [closed]
  18. How to round decimal value up to nearest 0.05 value?
  19. Casting: (NewType) vs. Object as NewType [duplicate]
  20. Environment.TickCount vs DateTime.Now
  21. How to suppress a StyleCop warning?
  22. Creating Directories in a ZipArchive C# .Net 4.5
  23. working with incredibly large numbers in .NET
  24. How to remove a single Attribute (e.g. ReadOnly) from a File?
  25. Is the Linq Count() faster or slower than List.Count or Array.Length?
  26. Is this a bad practice to catch a non-specific exception such as System.Exception? Why?
  27. What is the difference between StreamWriter.Flush() and StreamWriter.Close()?
  28. How to create a Button that can send keys to a conrol without losing focus – Virtual Keyboard
  29. Reading a date using DataReader
  30. LINQ Query to Convert string to datetime

Leave a Comment