def calculateAcceleration( measurement1, measurement2 ):
validUnitTypes = [
[ 'velocity', 'distance' ],
[ 'distance', 'time' ],
]
acceleration = RPNMeasurement( '1.0', 'meter/second^2' )
return acceleration.convert( 'meter/second^2' )
def calculateVelocity( measurement1, measurement2 ):
validUnitTypes = [
[ 'length', 'time' ],
[ 'velocity', 'time' ],
[ 'acceleration', 'time' ],
[ 'acceleration', 'distance' ],
[ 'jerk', 'time' ],
[ 'jerk', 'distance' ],
[ 'jounce', 'time' ],
[ 'jounce', 'distance' ]
]
velocity = RPNMeasurement( '1.0', 'meter/second' )
return velocity.convert( 'meter/second' )
def calculateAcceleration( measurement1, measurement2 ):
validUnitTypes = [
[ 'velocity', 'distance' ],
[ 'velocity', 'time' ],
[ 'distance', 'time' ],
[ 'acceleration', 'time' ],
[ 'acceleration', 'distance' ],
]
arguments = matchUnitTypes( [ measurement1, measurement2 ], validUnitTypes )
if 'acceleration' in arguments:
acceleration = arguments[ 'acceleration' ]
else:
acceleration = RPNMeasurement( '1.0', 'meter/second^2' )
return acceleration.convert( 'meter/second^2' )
def subtract( self, time ):
if isinstance( time, RPNMeasurement ):
kneg = RPNMeasurement( fneg( time.getValue( ) ), time.getUnits( ) )
return self.add( kneg )
elif isinstance( time, RPNDateTime ):
if self > time:
delta = self - time
factor = 1
else:
delta = time - self
factor = -1
if delta.days != 0:
result = RPNMeasurement( delta.days * factor, 'day' )
result = result.add( RPNMeasurement( delta.seconds * factor, 'second' ) )
result = result.add( RPNMeasurement( delta.microseconds * factor, 'microsecond' ) )
elif delta.seconds != 0:
result = RPNMeasurement( delta.seconds * factor, 'second' )
result = result.add( RPNMeasurement( delta.microseconds * factor, 'microsecond' ) )
else:
result = RPNMeasurement( delta.microseconds * factor, 'microsecond' )
return result
else:
raise ValueError( 'incompatible type for subtracting from an absolute time' )
def getProduct( n ):
if isinstance( n, RPNGenerator ):
return getProduct( list( n ) )
elif isinstance( n[ 0 ], ( list, RPNGenerator ) ):
return [ getProduct( arg ) for arg in n ]
if not n:
return 0
elif len( n ) == 1:
return n[ 0 ]
hasUnits = False
for item in n:
if isinstance( item, RPNMeasurement ):
hasUnits = True
break
if hasUnits:
result = RPNMeasurement( 1, { } )
for item in n:
if isinstance( item, list ):
return [ getProduct( arg ) for arg in item ]
result = result.multiply( item )
return result
else:
if not n:
return 0
if isinstance( n[ 0 ], list ):
return [ getProduct( item ) for item in n ]
else:
return fprod( n )
def getPower( n, k ):
if isinstance( n, RPNMeasurement ):
result = RPNMeasurement( n )
return result.exponentiate( k )
else:
return power( n, k )