Created
August 25, 2009 19:56
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| >> class Numeric | |
| >> def sqrt | |
| >> Math.sqrt self | |
| >> end | |
| >> def cbrt | |
| >> neg = self < 0 | |
| >> c = abs.sqrt.sqrt | |
| >> i = 2 | |
| >> loop do | |
| ?> w = c | |
| >> i.times { w = w.sqrt } | |
| >> i *= 2 | |
| >> w *= c | |
| >> break if c == w | |
| >> c = w | |
| >> end | |
| >> neg ? -c : c | |
| >> end | |
| >> end | |
| => nil | |
| >> a = 9999999999*9999999999*9999999999 | |
| => 999999999700000000029999999999 | |
| >> a.cbrt | |
| => 9999999999.0 |
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