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Derivative of a Function
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| def deriv(f) | |
| dx = 0.000001 | |
| ->(x) { (f.(x+dx) - f.(x)) / dx } | |
| end | |
| f = ->(x) { x*x + 2*x + 1 } | |
| g = deriv(f) | |
| g.(2) | |
| # => 6.000001000927568 |
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