Quinai's Forum Posts

• • Quinai
  • 
  • • Joined 17 Dec, 2010
    • 
    • 0 topics • 2 posts
  • 1

  • 19 Jan, 2011
  • Quote

  What you're trying to find is the logarithm, not the power.

  For 8^2 = 64, 8 is the base, 64 is the power and 2 is the exponent. The exponent equals the logarithm of the power as long as you don't change the base.

  http://sourceforge.net/apps/mediawiki/c ... xpressions <-- Look under "Math".

  Use ln for base e (Euler's number, approx. 2.718) or log for base 10.

  For example: 10^x = 1000. To find x, just do:

  log(1000)[/code:3jalj99k]
  ...which gives you 3.
  
  If the base isn't 10 or [i]e[/i], use this instead: [code:3jalj99k]log(power) / log(base)[/code:3jalj99k]
  (You can use [b]ln[/b] instead of [b]log[/b], the result should be the same.)
  
  Using the example above, 8^2 = 64, you get [code:3jalj99k]log(64) / log(8)[/code:3jalj99k]
  ...and that should give you 2.

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• • Quinai
  • 
  • • Joined 17 Dec, 2010
    • 
    • 0 topics • 2 posts
  • 1

  • 17 Dec, 2010
  • Quote

  The math geek in me forced me to register just to answer this question.

  There's a really simple way to get almost exactly what you're after: For every random value you need, generate two random values and pick the lowest. For values of 1-100, that should give you:

  1-30: 51% of the time

  31-60: 33% of the time

  61-100: 16% of the time

  1-10: 19% of the time

  91-100: 1% of the time

  Should be about the same for 0-100.