Class: Keisan::Functions::Diff

Inherits:
Keisan::Function show all
Defined in:
lib/keisan/functions/diff.rb

Instance Attribute Summary

Attributes inherited from Keisan::Function

#name

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Diff

Returns a new instance of Diff.



4
5
6
 
# File 'lib/keisan/functions/diff.rb', line 4

def initialize
  @name = "diff"
end

Instance Method Details

#evaluate(ast_function, context = nil) ⇒ Object 



19
20
21
22
23
24
25
26
27
28
29
30
 
# File 'lib/keisan/functions/diff.rb', line 19

def evaluate(ast_function, context = nil)
  context ||= Context.new
  function, vars = function_and_vars(ast_function)

  vars.inject(function.evaluate(context)) do |result, variable|
    result = differentiate(result, variable, context)
    if !is_ast_derivative?(result)
      result = result.evaluate(context)
    end
    result
  end
end

#simplify(ast_function, context = nil) ⇒ Object 



32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/keisan/functions/diff.rb', line 32

def simplify(ast_function, context = nil)
  context ||= Context.new
  function, vars = function_and_vars(ast_function)

  vars.inject(function.simplify(context)) do |result, variable|
    result = differentiate(result, variable, context)
    if !is_ast_derivative?(result)
      result = result.simplify(context)
    end
    result
  end
end

#value(ast_function, context = nil) ⇒ Object 



8
9
10
11
12
13
14
15
16
17
 
# File 'lib/keisan/functions/diff.rb', line 8

def value(ast_function, context = nil)
  context ||= Keisan::Context.new
  evaluation = evaluate(ast_function, context)

  if is_ast_derivative?(evaluation)
    raise Keisan::Exceptions::NonDifferentiableError.new
  else
    evaluation.value(context)
  end
end