Opened 3 years ago
Last modified 3 years ago
#19093 new defect
bug in units conversion
| Reported by: | schymans | Owned by: | |
|---|---|---|---|
| Priority: | major | Milestone: | sage-6.9 |
| Component: | symbolics | Keywords: | units |
| Cc: | Merged in: | ||
| Authors: | Reviewers: | ||
| Report Upstream: | N/A | Work issues: | |
| Branch: | Commit: | ||
| Dependencies: | Stopgaps: |
Description
The .convert() function converts units to their base units, e.g.
sage: (units.energy.joule).convert()
kilogram*meter^2/second^2
The units of heat capacity are joule/kelvin/kilogram and since joule is not a base unit, it should be possible to convert them to base units. However, this throws an error:
sage: (units.energy.joule/units.temperature.kelvin/units.mass.kilogram).convert()
Traceback (click to the left of this block for traceback) ... ValueError: Cannot convert
This seems to be the case whenever something is divided by temperature.
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Goodness, did I really create this ticket only 3 weeks ago? Just googled it again and found the same issue asked by myself 2 years ago with a proposed workaround by Eviatar Bach: http://ask.sagemath.org/question/10260/convert-derived-si-units-to-base-units/