Class: Unitwise::Functional

Inherits:
Scale
  • Object
show all
Extended by:
Math
Defined in:
lib/unitwise/functional.rb

Overview

Functional is an alterative function-based scale for atoms with a non-linear (or non-zero y-intercept) scale. This is most commonly used for temperatures. Known functions for converting to and from special atoms are setup as class methods here.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Scale

#atoms, #depth, #eql?, #expression, #hash, #inspect, #root_terms, #simplified_value, #special?, #terms, #to_s, #unit=

Methods included from Compatible

#<=>, #compatible_with?, #composition, #composition_string, #dim, included

Constructor Details

#initialize(value, unit, function_name) ⇒ Functional

Setup a new functional. used for conversion

Parameters:

  • value (Numeric) —

    The magnitude of the scale

  • unit (Unitwise::Unit, String) —

    The unit of the scale

  • function_name (String, Symbol) —

    One of the class methods above to be


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# File 'lib/unitwise/functional.rb', line 104

def initialize(value, unit, function_name)
  @function_name = function_name
  super(value, unit)
end

Instance Attribute Details

#function_name ⇒ Object (readonly)

Returns the value of attribute function_name.


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# File 'lib/unitwise/functional.rb', line 97

def function_name
  @function_name
end

Class Method Details

.from_2lg(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 93

def self.from_2lg(x)
  10.0 ** (x / 2.0)
end

.from_cel(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 13

def self.from_cel(x)
  x + 273.15
end

.from_degf(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 21

def self.from_degf(x)
  5.0 / 9.0 * (x + 459.67)
end

.from_degre(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 29

def self.from_degre(x)
  5.0 / 4.0 * (x + 218.52)
end

.from_hpC(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 45

def self.from_hpC(x)
  100.0 ** -x
end

.from_hpX(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 37

def self.from_hpX(x)
  10.0 ** -x
end

.from_ld(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 69

def self.from_ld(x)
  2.0 ** x
end

.from_lg(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 85

def self.from_lg(x)
  10.0 ** x
end

.from_ln(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 77

def self.from_ln(x)
  Math::E ** x
end

.from_ph(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 61

def self.from_ph(x)
  from_hpX(x)
end

.from_tan100(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 53

def self.from_tan100(x)
  atan(x / 100.0)
end

.to_2lg(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 89

def self.to_2lg(x)
  2.0 * log10(x)
end

.to_cel(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 9

def self.to_cel(x)
  x - 273.15
end

.to_degf(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 17

def self.to_degf(x)
  9.0 * x / 5.0 - 459.67
end

.to_degre(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 25

def self.to_degre(x)
  4.0 * x / 5.0 - 218.52
end

.to_hpC(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 41

def self.to_hpC(x)
  -log(x) / log(100.0)
end

.to_hpX(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 33

def self.to_hpX(x)
  -log10(x)
end

.to_ld(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 65

def self.to_ld(x)
  Math.log(x) / Math.log(2.0)
end

.to_lg(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 81

def self.to_lg(x)
  log10(x)
end

.to_ln(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 73

def self.to_ln(x)
  log(x)
end

.to_ph(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 57

def self.to_ph(x)
  to_hpX(x)
end

.to_tan100(x) ⇒ Object 


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# File 'lib/unitwise/functional.rb', line 49

def self.to_tan100(x)
  100.0 * tan(x)
end

Instance Method Details

#magnitude(scalar = scalar()) ⇒ Numeric

Get the equivalent magnitude on this scale for a scalar value

Parameters:

  • scalar (Numeric) (defaults to: scalar()) —

    A linear scalar value

Returns:

  • (Numeric) —

    The equivalent magnitude on this scale


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# File 'lib/unitwise/functional.rb', line 121

def magnitude(scalar = scalar())
  self.class.send(:"to_#{function_name}", scalar)
end

#scalar(magnitude = value) ⇒ Numeric

Get the equivalent scalar value of a magnitude on this scale

Parameters:

  • magnitude (Numeric) (defaults to: value) —

    The magnitude to find the scalar value for

Returns:

  • (Numeric) —

    Equivalent linear scalar value


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# File 'lib/unitwise/functional.rb', line 113

def scalar(magnitude = value)
  self.class.send(:"from_#{function_name}", magnitude)
end