CDAT Newsletter, June 2007
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Units conversion with genutil.udunits
Goal: Learn about units conversion functions in genutil.udunits module.
First you need to import genutil.udunits module
import cdms,genutil,unidataInitialization of a unidata object
a = unidata.udunits(value,units)Initialize an object 'a' measureing 5m, convert to in and save as obj. 'b', then add 'a' and 'b'. Notice that they have different units! The reuslt will be in 'm'
a=unidata.udunits(5,'m')
b=unidata.udunits(6,'in')
c=a+budunits(5.1524,"m")
More units conversions
a.units='feet‘ ; print a16.4041994751 feetc=a.to('km')udunits(0.005,"km")c=unidata.udunits(7,'K') ; factor, offset = c.how('degF')(1.8, -459.67)
Find out what are the units
# list of all known units
lst = c.available_units()
# dictionary: units (keys) / type (values)
dict = c.known_units()
dict['k']
# returns: 'THERMODYNAMIC TEMPERATURE'
dict = c.known_units(bytype=1)
# returns a dictionary of units type (keys)
# associated with a list of units for each type >
dict['THERMODYNAMIC TEMPERATURE']
# returns ['degree_Kelvin', 'degree_Celsius', …]
