/usr/share/doc/ruby-gsl/examples/histogram/exponential.rb is in ruby-gsl 2.1.0.3+dfsg1-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!/usr/bin/env ruby
require("gsl")
N = 10000
rng = GSL::Rng.alloc
data = rng.exponential(2, N)
h = GSL::Histogram.alloc(100, [0, 15])
h.fill(data)
#result = h.fit_exponential
result = h.fit("exponential")
a = result[0]
b = result[1]
x = GSL::Vector.linspace(0, 15, 100)
y = a*GSL::Sf::exp(x*b)
GSL::graph(h, [x, y], "-C -g 3")
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