Class: Keisan::Functions::Diff
- Inherits:
-
Keisan::Function
- Object
- Keisan::Function
- Keisan::Functions::Diff
- Defined in:
- lib/keisan/functions/diff.rb
Instance Attribute Summary
Attributes inherited from Keisan::Function
Instance Method Summary collapse
- #evaluate(ast_function, context = nil) ⇒ Object
-
#initialize ⇒ Diff
constructor
A new instance of Diff.
- #simplify(ast_function, context = nil) ⇒ Object
- #value(ast_function, context = nil) ⇒ Object
Methods inherited from Keisan::Function
Constructor Details
#initialize ⇒ Diff
Returns a new instance of Diff.
4 5 6 7 |
# File 'lib/keisan/functions/diff.rb', line 4 def initialize super("diff", -1) @name = "diff" end |
Instance Method Details
#evaluate(ast_function, context = nil) ⇒ Object
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 |
# File 'lib/keisan/functions/diff.rb', line 21 def evaluate(ast_function, context = nil) validate_arguments!(ast_function.children.count) context ||= Context.new function, variables = function_and_variables(ast_function) local = context_from(variables, context) result = variables.inject(function.evaluate(local)) do |result, variable| result = differentiate(result, variable, local) if !is_ast_derivative?(result) result = result.evaluate(local) end result end case result when AST::Function result.name == "diff" ? result : result.simplify(context) else result.simplify(context) end end |
#simplify(ast_function, context = nil) ⇒ Object
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 |
# File 'lib/keisan/functions/diff.rb', line 43 def simplify(ast_function, context = nil) validate_arguments!(ast_function.children.count) raise Exceptions::InternalError.new("received non-diff function") unless ast_function.name == "diff" function, variables = function_and_variables(ast_function) context ||= Context.new local = context_from(variables, context) result = variables.inject(function.simplify(local)) do |result, variable| result = differentiate(result, variable, local) if !is_ast_derivative?(result) result = result.simplify(local) end result end case result when AST::Function result.name == "diff" ? result : result.simplify(context) else result.simplify(context) end end |
#value(ast_function, context = nil) ⇒ Object
9 10 11 12 13 14 15 16 17 18 19 |
# File 'lib/keisan/functions/diff.rb', line 9 def value(ast_function, context = nil) validate_arguments!(ast_function.children.count) context ||= Context.new evaluation = evaluate(ast_function, context) if is_ast_derivative?(evaluation) raise Exceptions::NonDifferentiableError.new else evaluation.value(context) end end |