81 lines
2.3 KiB
Python
81 lines
2.3 KiB
Python
import sympy as sp
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import sympy.physics.units as spu
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####################
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# - Useful Methods
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####################
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def uses_units(expression: sp.Expr) -> bool:
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"""Checks if an expression uses any units (`Quantity`)."""
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for arg in sp.preorder_traversal(expression):
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if isinstance(arg, spu.Quantity):
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return True
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return False
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# Function to return a set containing all units used in the expression
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def get_units(expression: sp.Expr):
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"""Gets all the units of an expression (as `Quantity`)."""
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return {
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arg
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for arg in sp.preorder_traversal(expression)
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if isinstance(arg, spu.Quantity)
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}
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####################
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# - Force
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####################
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# Newton
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nanonewton = nN = spu.Quantity("nanonewton", abbrev="nN")
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nanonewton.set_global_relative_scale_factor(spu.nano, spu.newton)
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micronewton = uN = spu.Quantity("micronewton", abbrev="μN")
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micronewton.set_global_relative_scale_factor(spu.micro, spu.newton)
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millinewton = mN = spu.Quantity("micronewton", abbrev="mN")
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micronewton.set_global_relative_scale_factor(spu.milli, spu.newton)
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####################
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# - Frequency
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####################
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# Hertz
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kilohertz = kHz = spu.Quantity("kilohertz", abbrev="kHz")
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kilohertz.set_global_relative_scale_factor(spu.kilo, spu.hertz)
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megahertz = MHz = spu.Quantity("megahertz", abbrev="MHz")
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kilohertz.set_global_relative_scale_factor(spu.kilo, spu.hertz)
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gigahertz = GHz = spu.Quantity("gigahertz", abbrev="GHz")
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gigahertz.set_global_relative_scale_factor(spu.giga, spu.hertz)
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terahertz = THz = spu.Quantity("terahertz", abbrev="THz")
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terahertz.set_global_relative_scale_factor(spu.tera, spu.hertz)
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petahertz = PHz = spu.Quantity("petahertz", abbrev="PHz")
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petahertz.set_global_relative_scale_factor(spu.peta, spu.hertz)
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exahertz = EHz = spu.Quantity("exahertz", abbrev="EHz")
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exahertz.set_global_relative_scale_factor(spu.exa, spu.hertz)
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####################
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# - Sympy Expression Typing
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####################
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#ALL_UNIT_SYMBOLS = {
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# unit
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# for unit in spu.__dict__.values()
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# if isinstance(unit, spu.Quantity)
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#}
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#def has_units(expr: sp.Expr):
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# return any(
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# symbol in ALL_UNIT_SYMBOLS
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# for symbol in expr.atoms(sp.Symbol)
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# )
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#def is_exactly_expressed_as_unit(expr: sp.Expr, unit) -> bool:
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# #try:
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# converted_expr = expr / unit
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#
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# return (
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# converted_expr.is_number
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# and not converted_expr.has(spu.Quantity)
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# )
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