Contents

require 'dydx/helper'
require 'dydx/algebra'
require 'dydx/delta'
require 'dydx/function'
require 'dydx/integrand'

module Dydx
  include Algebra
  %w(f g h temp_cal_f).each do |functioner|
    define_method(functioner) do |*vars|
      function = eval("$#{functioner}")
      return eval("$#{functioner} = Function.new(*vars)") unless function

      fail ArgumentError, "invalid number of values (#{vars.count} for #{function.vars.count})" unless function.vars.count == vars.count
      return function if function.vars == vars || !function.algebra

      subst_hash = Hash[*[function.vars, vars].transpose.flatten]
      begin
        function.algebra.subst(subst_hash).to_f
      rescue ArgumentError
        eval(function.algebra.subst(subst_hash).to_s)
      end
    end
  end

  def S(function, delta)
    Integrand.new(function, delta.var)
  end

  def d
    Delta.new
  end

  def reset
    $f, $g, $h = nil, nil, nil
  end

  def _(*args)
    case args.count
    when 1
      num = args.first
      Num.new(num)
    when 3
      ltr, op, rtr = args
      ltr.send(op, rtr)
    end
  end

  def method_missing(method, *args, &block)
    method_name = method.to_s
    if method_name =~ /^d.$/
      Delta.new(method_name[1].to_sym, args.first)
    elsif method_name =~ /^[a-z]$/
      method_name.to_sym
    else
      super
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
dydx-0.1.4	lib/dydx.rb