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Re: On Quantity - Measurement relationship

  • From: Martin Desruisseaux < >
  • To:
  • Subject: Re: On Quantity - Measurement relationship
  • Date: Sat, 01 Nov 2014 18:32:57 +0900
  • Organization: Geomatys

Hello Jean-Marie

I agree that a vector is not a quantity. It was indeed my point in my
previous email: a vector could not fit in a hierarchy where Quantity
extends Measurement. It was my argument for keeping the current
hierarchy, so a Vector can extends a Measurement without extending a
Quantity.

    Martin



Le 01/11/14 17:19, Jean-Marie Dautelle a écrit :
> Hi Martin and All,
>
> A scalar is a physical quantity that it represented by a dimensional
> number at a particular point in space and time. Examples are
> hydrostatic pressure and temperature.
>
> A vector is a bookkeeping tool to keep track of two pieces of
> information (typically magnitude and direction) for a physical quantity. 
>
> From this reference book definition we see that a vector is not a
> quantity (only its magnitude is). Therefore to respond to Martin (and
> what should be written in the spec) is that a Vector/Tensor does not
> belongs to this hierarchy and they are aggregate of quantities or
> aggregate of one quantity with something else (direction)
>
> A possible choice to enforce this notion of "magnitude" for measured
> quantity would be to replace the name Measurement with Amount !
>
> I hope this help.
>
> Jean-Marie.



On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Jean-Marie Dautelle 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Jean-Marie Dautelle 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Jean-Marie Dautelle 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014
 
 
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