Convert derived SI units to base units

asked 2013-06-20 09:10:16 +0100

stan
587 ●19 ●35 ●61

How can I convert SI units involving temperature (kelvin) to their base units?

Example using units of heat capacity:

# Temperature units multiplied by other units cannot be converted
blah = units.energy.joule/units.temperature.kelvin
blah.convert()

Traceback (click to the left of this block for traceback)

...

ValueError: Cannot convert

I need this output:

units.energy.joule.convert()/units.temperature.kelvin.convert()

kilogram*meter^2/(kelvin*second^2)

There is a discussion of this issue at the link below, but there should be a function to convert to base units in the absence of numerical values. Link: [https://groups.google.com/forum/#!sea...]

Does anyone know how to do this?

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def convert(expr): op = expr.operator() ops = expr.operands() if op: if len(ops) == 2: return op(*map(convert, ops)) else: return op(convert(ops[0]), reduce(op, map(convert, ops[1:]))) else: return expr.convert() if hasattr(expr, 'convert') else expr

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