Exemplo n.º 1
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def test_named_pickle():
    """Pickling is reversible on quantities backed by named units"""
    named = named_unit('S', 'N', 'D')
    arbitrary_quantity = named(3.0)
    pickled = dumps(arbitrary_quantity)
    unpickled = loads(pickled)
    assert within_epsilon(arbitrary_quantity, unpickled)
Exemplo n.º 2
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    def __init__(self, codata):
        #SI units
        self.si_mass = unit('kg')
        self.si_charge = unit('C')
        self.si_energy = unit('J')
        self.si_action = unit('J') * unit('s')
        self.si_time = unit('s')
        self.si_frequency = unit('Hz')
        #farad_per_meter = unit('F') / unit('m')

        self.codata = codata

        #Define basic atomic units constants
        self.mass = scaled_unit('mass_au', *codata['electron mass'])
        self.charge = scaled_unit('charge_au', *codata['atomic unit of charge'])
        self.electrostatic_constant = named_unit('eps0_au', ['F'], ['m'],
                codata['atomic unit of permittivity'][1])
        self.hbar = named_unit('action_au', ['J'], ['s'],
                codata['atomic unit of action'][1])
        self.alpha = codata['fine-structure constant'][1]
        self.time = scaled_unit('time_au', *codata['atomic unit of time'])

        #Derived units
        self.speed = scaled_unit("speed_au", *codata['atomic unit of velocity'])
        self.lightspeed = self.speed(codata['speed of light in vacuum'][1])
        self.length = scaled_unit('length_au', 'm',
                (self.electrostatic_constant * self.hbar**2 /
                    (self.mass * self.charge**2)).squeeze())
        self.energy = scaled_unit('energy_au', 'J',
                (self.hbar**2 / (self.mass * self.length**2)).squeeze())
        self.electric_field_strength = named_unit('efield_au', ['V'], ['m'],
            (self.charge / (self.electrostatic_constant * self.length**2)).squeeze())
        self.frequency = scaled_unit('frequency_au', 'Hz', 1.0/self.time.squeeze())

        #Other units
        self.electron_volt = scaled_unit('eV', *codata['electron volt'])
        self.femtosecond = scaled_unit('fs', 's', self.si_time.squeeze()*1e-15)
Exemplo n.º 3
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"""Define the scalar units used by vehicle measurements."""

import sys
from units import unit, scaled_unit, named_unit
import units.predefined

units.predefined.define_units()

Percentage = unit('%')
Meter = unit('m')
Kilometer = scaled_unit('km', 'm', 1000)
Hour = unit('h')
KilometersPerHour = unit('km') / unit('h')
RotationsPerMinute = unit('rotations') / unit('m')
Litre = unit('L')
Degree = unit('deg')
NewtonMeter = named_unit("Nm", ["N", "m"], [])
MetersPerSecondSquared = unit('m') / (pow(unit('s'), 2))
Undefined = unit('undef')
Exemplo n.º 4
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def define_complex_si_units():
    """Define SI units that are built on other SI units.
    
    >>> define_complex_si_units()
    >>> unit('Hz').is_si()
    True
    """
    LeafUnit("rad", name="radian", is_si=True)  # Plane angle
    LeafUnit("sr", name="steradian", is_si=True)  # Solid angle

    named_unit("Hz", [], ["s"], name="hertz")  # Frequency
    named_unit("N", ["m", "kg"], ["s", "s"], name="newton")  # Force
    named_unit("Pa", ["N"], ["m", "m"], name="pascal")  # Pressure or mechanical stress
    named_unit("J", ["N", "m"], [], name="joule")  # Energy, work, or amount of heat (Dangerous, 3J is a complex number)
    named_unit("W", ["J"], ["s"], name="watt")  # Power or heat flow rate
    named_unit("C", ["s", "A"], [], name="coulomb")  # Electric charge
    named_unit("V", ["W"], ["A"], name="volt")  # Electromotive force, electric potential difference
    named_unit("Ohm", ["V"], ["A"], symbal=u"Ω", name="ohm")  # Electrical resistance
    named_unit("F", ["C"], ["V"], name="farad")  # Capacitance
    named_unit("Wb", ["V", "s"], [], name="weber")  # Magnetic flux
    named_unit("T", ["Wb"], ["m", "m"], name="tesla")  # Magnetic flux density
    named_unit("H", ["Wb"], ["A"], name="henry")  # Inductance
    named_unit("lm", ["cd", "sr"], [], name="lumen")  # Luminous flux
    named_unit("lx", ["lm"], ["m", "m"], name="lux")  # Illuminance
    named_unit("Bq", [], ["s"], name="becquerel")  # Radiation - source activity
    named_unit("Gy", ["J"], ["kg"], name="gray")  # Radiation - absorbed dose
    named_unit("Sv", ["J"], ["kg"], name="sievert")  # Radiation - equivalent dose
    named_unit("S", ["A"], ["V"], name="siemens")  # Siemens
    named_unit("kat", ["mol"], ["s"], name="katal")  # Katal
Exemplo n.º 5
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"""Define the scalar units used by vehicle measurements."""
from __future__ import absolute_import

import sys
from units import unit, scaled_unit, named_unit
import units.predefined

units.predefined.define_units()


Percentage = unit("%")
Meter = unit("m")
Kilometer = scaled_unit("km", "m", 1000)
Hour = unit("h")
KilometersPerHour = unit("km") / unit("h")
RotationsPerMinute = unit("rotations") / unit("m")
Litre = unit("L")
Degree = unit("deg")
NewtonMeter = named_unit("Nm", ["N", "m"], [])
MetersPerSecondSquared = unit("m") / (pow(unit("s"), 2))
Undefined = unit("undef")
Exemplo n.º 6
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def define_complex_si_units():
    """Define SI units that are built on other SI units.
    
    >>> define_complex_si_units()
    >>> unit('Hz').is_si()
    True
    """
    for sym in ["rad", "sr"]:  
        LeafUnit(sym, is_si=True)

    named_unit("Hz", [], ["s"]) #hertz
    named_unit("N", ["m", "kg"], ["s", "s"]) #Newton
    named_unit("Pa", ["N"], ["m", "m"]) #pascal
    named_unit("J", ["N", "m"], []) #Joule # Dangerous, 3J is a complex number
    named_unit("W", ["J"], ["s"]) # Watt
    named_unit("C", ["s", "A"], []) # Coulomb
    named_unit("V", ["W"], ["A"]) # Volt
    named_unit("F", ["C"], ["V"]) # Farad
    named_unit("Ohm", ["V"], ["A"]) 
    named_unit("S", ["A"], ["V"])   #Siemens
    named_unit("Wb", ["V", "s"], []) # Weber
    named_unit("T", ["Wb"], ["m", "m"]) # Tesla
    named_unit("H", ["Wb"], ["A"]) # Henry
    named_unit("lm", ["cd", "sr"], []) # lumen 
    named_unit("lx", ["lm"], ["m", "m"]) #lux
    named_unit("Bq", [], ["s"]) # Becquerel
    named_unit("Gy", ["J"], ["kg"]) # Gray
    named_unit("Sv", ["J"], ["kg"]) # Sievert
    named_unit("kat", ["mol"], ["s"]) # Katal
Exemplo n.º 7
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def define_complex_si_units():
    """Define SI units that are built on other SI units.

    >>> define_complex_si_units()
    >>> unit('Hz').is_si()
    True
    """
    for sym in ["rad", "sr"]:
        LeafUnit(sym, is_si=True)

    named_unit("Hz", [], ["s"]) #hertz
    named_unit("N", ["m", "kg"], ["s", "s"]) #Newton
    named_unit("Pa", ["N"], ["m", "m"]) #pascal
    named_unit("J", ["N", "m"], []) #Joule # Dangerous, 3J is a complex number
    named_unit("W", ["J"], ["s"]) # Watt
    named_unit("C", ["s", "A"], []) # Coulomb
    named_unit("V", ["W"], ["A"]) # Volt
    named_unit("F", ["C"], ["V"]) # Farad
    named_unit("Ohm", ["V"], ["A"])
    named_unit("S", ["A"], ["V"])   #Siemens
    named_unit("Wb", ["V", "s"], []) # Weber
    named_unit("T", ["Wb"], ["m", "m"]) # Tesla
    named_unit("H", ["Wb"], ["A"]) # Henry
    named_unit("lm", ["cd", "sr"], []) # lumen
    named_unit("lx", ["lm"], ["m", "m"]) #lux
    named_unit("Bq", [], ["s"]) # Becquerel
    named_unit("Gy", ["J"], ["kg"]) # Gray
    named_unit("Sv", ["J"], ["kg"]) # Sievert
    named_unit("kat", ["mol"], ["s"]) # Katal