Contents

require "congruence_solver"
require "benchmark"
require_relative "./bench_tools.rb"


SMALL_DEG_POLYNOMIAL_COEFFS = [1, -4, 4] 
LARGE_DEG_POLYNOMIAL_COEFFS = [-11, 0, 0, 3, 0, 0, 0, 0, 0, 10]
SMALL_MOD = 49
MED_MOD = 5104
LARGE_MOD = 94122
XTRA_LARGE_MOD = 401249
XTRA_LARGE_PRIME_MOD = 306893
SMALL_FACTORED_LARGE_MOD = 510510


def solve_congruence_brute_force(coeffs, mod)
  solutions = []

  0.upto(mod) do |x|
    sum = 0

    coeffs.each_with_index do |coe, exp|
      sum = (sum + coe*x**exp) % mod
    end

    if sum == 0 then solutions << x end
  end

  solutions
end


def bm_solve_congruence(coeffs, mod) 
    puts "Solving #{polynomial_to_s(coeffs)} = 0 mod #{mod}"

    rb_bf_solutions = solve_congruence_brute_force(coeffs, mod).sort
    #c_bf_solutions = CongruenceSolver.brute_force(coeffs, mod).sort
    c_lifting_solutions = CongruenceSolver.lift(coeffs, mod).sort

    unless rb_bf_solutions == c_lifting_solutions #and c_bf_solutions c_lift_solutions
      puts "Solutions do not match:"
      puts "Ruby/force solutions #{rb_bf_solutions.inspect}"
      #puts "C/force solutions #{c_bf_solutions}"
      puts "C/lifting solutions: #{c_lifting_solutions.inspect}"
    end

    puts "Time measurements:"

    Benchmark.bmbm do |bm|
      bm.report("Ruby/force") do
        solve_congruence_brute_force(coeffs, mod)
      end
=begin
      bm.report("C/force") do
        CongruenceSolver.brute_force(coeffs, mod)
      end
=end
      bm.report("C/lifting") do
        CongruenceSolver.lift(coeffs, mod)
      end
    end

    print "\n\n"
end


[SMALL_DEG_POLYNOMIAL_COEFFS, LARGE_DEG_POLYNOMIAL_COEFFS].each do |coeffs|
  [SMALL_MOD, MED_MOD, LARGE_MOD, XTRA_LARGE_MOD, XTRA_LARGE_PRIME_MOD, SMALL_FACTORED_LARGE_MOD].each do |mod|
    bm_solve_congruence(coeffs, mod)
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
congruence_solver-0.4.0	bench/solve_congruence_bm.rb
congruence_solver-0.3.2	bench/solve_congruence_bm.rb