Class: SyMath::Definition::Ln

Inherits:
Function show all
Defined in:
lib/symath/definition/ln.rb

Instance Attribute Summary

Attributes inherited from Operator

#args, #exp

Attributes inherited from SyMath::Definition

#name

Instance Method Summary collapse

Methods inherited from Function

#check_pi_fraction, functions, init_builtin, #is_function?, #latex_format

Methods inherited from Operator

#<=>, #==, #arity, #call, #compose_with_simplify, #dump, #evaluate_call, init_builtin, #is_operator?, #latex_format, operators, #replace, #to_latex, #to_s, #validate_args

Methods inherited from SyMath::Definition

#<=>, #==, #arity, define, defined?, definitions, get, #hash, init_builtin, #inspect, #is_constant?, #is_function?, #is_operator?, #replace, #to_latex, #to_s, undefine, #variables

Methods inherited from Value

#*, #**, #+, #-, #-@, #/, #<, #<=, #<=>, #>, #>=, #^, #add, #base, compose_with_simplify, create, #deep_clone, #div, #dump, #evaluate, #exponent, #factors, #inspect, #inv, #is_divisor_factor?, #is_finite?, #is_nan?, #is_negative?, #is_negative_number?, #is_number?, #is_positive?, #is_prod_exp?, #is_sum_exp?, #is_unit_quaternion?, #is_zero?, #mul, #neg, #power, #reduce, #reduce_modulo_sign, #sign, #sub, #terms, #to_m, #type, #wedge

Methods included from Operation::Exterior

#flat, #hodge, #sharp

Methods included from Operation::Integration

#anti_derivative, #get_linear_constants, initialize, #int_constant, #int_failure, #int_function, #int_inv, #int_pattern, #int_power, #int_product, #int_sum, #integral_bounds

Methods included from Operation::Differential

#_d_wedge, #d, #d_failure, #d_fraction, #d_function, #d_function_def, #d_power, #d_product, initialize

Methods included from Operation

#iterate, #recurse

Methods included from Operation::DistributiveLaw

#combfrac_add_term, #combfrac_sum, #combine_fractions, #expand, #expand_product, #expand_single_pass, #factorize, #factorize_integer_poly, #factorize_simple, #has_fractional_terms?

Methods included from Operation::Normalization

#combine_factors, #compare_factors_and_swap, #normalize, #normalize_matrix, #normalize_power, #normalize_product, #normalize_single_pass, #normalize_sum, #order_product, #product_on_fraction_form, #reduce_constant_factors, #replace_combined_factors, #swap_factors

Methods included from Operation::Match

#build_assoc_op, #match, #match_assoc, #match_replace

Constructor Details

#initialize ⇒ Ln

Returns a new instance of Ln.



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# File 'lib/symath/definition/ln.rb', line 5

def initialize()
  super(:ln)

  @reductions_real = {
    1.to_m   => 0.to_m,
    :e.to_m  => 1.to_m,
    0.to_m   => -:oo.to_m,
    :oo.to_m => :oo.to_m,
  }

  @reductions_complex = {
    1.to_m      => 0.to_m,
    :e.to_m     => 1.to_m,
    -1.to_m     => :pi.to_m*:i,
    -:e.to_m    => 1.to_m + :pi.to_m*:i,
    :i.to_m     => :pi.to_m*:i/2,
    :e.to_m*:i  => 1.to_m + :pi.to_m*:i/2,
    -:i.to_m    => -:pi.to_m*:i/2,
    -:e.to_m*:i => 1.to_m - :pi.to_m*:i/2,
  }
end

Instance Method Details

#description ⇒ Object 



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# File 'lib/symath/definition/ln.rb', line 27

def description()
  return 'ln(x) - natural logarithm'
end

#reduce_call(c) ⇒ Object 



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# File 'lib/symath/definition/ln.rb', line 31

def reduce_call(c)
  arg = c.args[0]

  if SyMath.setting(:complex_arithmetic)
    return super(c, @reductions_complex)
  else
    if arg.is_a?(SyMath::Minus)
      return :nan.to_m
    end

    return super(c, @reductions_real)
  end
end