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Forum: Documentation and Examples
Re: Question CLHEP unit definitions (Adam Glaser)
Date: 05 Nov, 2012
From: michel maire <michel maire>

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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1 None: Re: CLHEP unit definitions   (Michael H. Kelsey - 06 Nov, 2012)
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