|Message: Re: CLHEP unit definitions||Not Logged In (login)|
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On Mon, 05 Nov 2012 13:39:28 GMT, Adam Glaser wrote:
> Hello, > > Does anyone have experience adding unit definitions to CLHEP? I am > simply trying to add inverse length units which would be very simply > converted to length units after being inverted. I have added my unit > definitions, but for some reason the inversion calculation is not being > performed correctly. > > i.e., For my inverse cm unit (icm), I am saying that icm=1./cm where > cm=10*mm. But what is happening is my unit is being converted to mm by > just multiplying what is entered by 1/10, instead of actually being > inverted. So GEANT4 is computing 5 icm as 0.5 cm, instead of 0.2 cm.
Somewhere in your application, you must define something like: new G4UnitDefinition("inverse_cm","1/cm" ,"inverseLength",1./cm);
The category "inverseLength" will be automatically created
> > Essentially what I am trying to do is analogous to converting hertz to > seconds. I checked the functionality and it seems that the same problem > occurs for converted hertz, i.e. it is not properly inverting the value > entered for hertz to seconds. >
The categories "Time" and "Frequency" are already defined and work well (as far as know ...) See G4UnitsDefinition.cc in source/global/management or tape /units/list
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