Parser for expressions concerning physical values
Units-filter is a basic standalone filter written in C language,
flex and bison. It inputs strings like "1.5e3 nN.m.s^-1" (it could
be the time growth ratio of a torque) and outputs the value in
standard SI unit, followed by the physical dimension of this value.
example :~/src$ echo 1.5e3 nN.m.s^-1 | units-filter
1.5e-06 2 1 -3 0 0 0 0 0 0
which means : 1.5e-06 (SI unit) m .kg.s
This parser can be embedded in educational test systems, in order to
analyze a student's answer to a problem of physics or chemistry.
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