/usr/share/doc/ruby-gsl/examples/poly/quadratic.rb is in ruby-gsl 2.1.0.3+dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #!/usr/bin/env ruby
require('gsl')
puts("Solve 2 - 3*x + x*x = 0")
p GSL::Poly.solve_quadratic([1, -3, 2])
p GSL::Poly.solve_quadratic(1, -3, 2)
z = GSL::Poly.complex_solve_quadratic(1, -3, 2)
printf("%f %f\n", z[0].re, z[0].im)
printf("%f %f\n", z[1].re, z[1].im)
#p GSL::Poly.complex_solve_quadratic([1, -3, 2])
#z = GSL::Poly.solve([2, -3, 1])
poly = GSL::Poly.alloc(2, -3, 1)
z = poly.solve
printf("%f %f\n", z[0].re, z[0].im)
printf("%f %f\n", z[1].re, z[1].im)
z = GSL::Poly.solve([2, -3, 1])
printf("%f %f\n", z[0].re, z[0].im)
printf("%f %f\n", z[1].re, z[1].im)
__END__
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