Class: Dcc::QuantityMath::Real

Inherits:
Quantity
  • Object
show all
Defined in:
lib/dcc/quantity_math/real.rb

Overview

BigDecimal arithmetic on real-valued quantities with RSS uncertainty propagation for add/sub and fractional propagation for mul/div.

Instance Attribute Summary

Attributes inherited from Quantity

#uncertainty, #unit, #value

Instance Method Summary collapse

Methods inherited from Quantity

#initialize, #same_unit?, #to_s, #uncertain?

Constructor Details

This class inherits a constructor from Dcc::QuantityMath::Quantity

Instance Method Details

#*(other) ⇒ Real

Returns:



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# File 'lib/dcc/quantity_math/real.rb', line 31

def *(other)
  new_value = value * other.value
  new_unit = compose_unit(unit, other.unit)
  Real.new(
    value: new_value,
    unit: new_unit,
    uncertainty: fractional_uncertainty_mul_div(other, new_value),
  )
end

#**(exponent) ⇒ Real

Parameters:

  • exponent (Integer)

Returns:



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# File 'lib/dcc/quantity_math/real.rb', line 54

def **(exponent)
  new_value = value ** exponent
  Real.new(
    value: new_value,
    unit: unit && "^#{exponent}",
    uncertainty: power_uncertainty(exponent, new_value),
  )
end

#+(other) ⇒ Real

Returns:



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# File 'lib/dcc/quantity_math/real.rb', line 11

def +(other)
  ensure_same_unit!(other)
  Real.new(
    value: value + other.value,
    unit: unit,
    uncertainty: rss_uncertainty(other),
  )
end

#-(other) ⇒ Real

Returns:



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# File 'lib/dcc/quantity_math/real.rb', line 21

def -(other)
  ensure_same_unit!(other)
  Real.new(
    value: value - other.value,
    unit: unit,
    uncertainty: rss_uncertainty(other),
  )
end

#/(other) ⇒ Real

Returns:



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# File 'lib/dcc/quantity_math/real.rb', line 42

def /(other)
  new_value = value / other.value
  new_unit = compose_unit(unit, inverse_unit(other.unit))
  Real.new(
    value: new_value,
    unit: new_unit,
    uncertainty: fractional_uncertainty_mul_div(other, new_value),
  )
end