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[jsr363-experts] Re: Request for clarification on Unit commensurability

  • From: Martin Desruisseaux < >
  • To:
  • Subject: [jsr363-experts] Re: Request for clarification on Unit commensurability
  • Date: Tue, 16 Dec 2014 14:43:58 +0900
  • Organization: Geomatys

Le 15/12/14 20:04, Werner Keil a écrit :
> According to this API interface
> https://github.com/unitsofmeasurement/unit-api/blob/master/src/main/java/javax/measure/quantity/Torque.java
> it doesn't, and since there are two different classes, Java would not
> consider them equal either;-)

Energy and Torque do have the same dimension, and the Dimension javadoc
said nothing about that. I repeat my request: what is the RI behavior
regarding that? Does Unit.isCompatible(Unit) returns true when comparing
Energy and Torque units?

I'm not asking for change - I'm trying to document our behaviour. We are
asking for comments, so we must said what we are doing!!!


> (...snip...) http://www.dagego.de/info_waermebedarf.html ;(...snip...)
> where
> Quantity<Energy> energy = (Quantity<Energy>) volume.multiply(temperature);

*Wrong:* the dimensions are clearly incompatibles. I suspect that the
equations given in the above page have a hidden constant, something like
the Boltzmann constant. In any case the above Java code is invalid and
must be rejected. Indeed, I already deleted this example from the
specification yesterday (and was horrified when I saw it).

To make the above code example valid, you would probably need to
multiply by the units of the Boltzmann constant, or something along that
line.

    Martin



[jsr363-experts] Request for clarification on Unit commensurability

Martin Desruisseaux 12/15/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Werner Keil 12/15/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Martin Desruisseaux 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Werner Keil 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Martin Desruisseaux 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Werner Keil 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Werner Keil 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Martin Desruisseaux 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Werner Keil 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Werner Keil 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Martin Desruisseaux 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Werner Keil 12/16/2014

[jsr363-experts] Re: Request for clarification on Unit commensurability

Martin Desruisseaux 12/16/2014
 
 
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