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Re: On Quantity - Measurement relationship
- From: Werner Keil <
>
- To: "
" <
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- Subject: Re: On Quantity - Measurement relationship
- Date: Sat, 1 Nov 2014 16:48:12 +0100
Wikipedia also mentions "scalar", etc. but it is clearly in Mathematics
only, while Physical Quantities
http://en.wikipedia.org/wiki/Physical_quantity also mention these terms,
but mainly regarding formula notation.
On an API level I would not really use PhysicalQuantity, while say
implementing modules like JScience Physics, etc. may define something like
it to extend Quantity or Measurement/Amount.
On Sat, Nov 1, 2014 at 4:37 PM, Werner Keil
<
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wrote:
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That's part of the Spec, while some terms there (OK, "Measurable" was
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already purged[?]) may be influenced by JSR 275 or the prior Unit-API
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Quantity currently refers to Wikipedia:
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http://en.wikipedia.org/wiki/Quantity
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Quantities can be compared in terms of "more", "less" or "equal", or, by
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assigning a numerical value in terms of a unit of measurement
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They are both called Quantity here, and thus having a base type Quantity
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allowing those non-numerical terms like "more", "less", "heavy", "light",
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"blue", "red" or "green", "Medium", "X-Large", etc. (often best represented
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by enums) and then something like Measurement (assigning a numerical
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value in terms of a unit of measurement)
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we'd perfecly cover both magnitude and multitude (or a more general
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non-numeric form)
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Werner
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On Sat, Nov 1, 2014 at 4:17 PM, Martin Desruisseaux <
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wrote:
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> Le 01/11/14 22:53, Jean-Marie Dautelle a écrit :
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> > Note: We see in that case that Quantity cannot implement Comparable.
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> > HEAVY/LIGHT may depend on the context, the boundary may not be well
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> > defined or be relative, e.g. we can compare HEAVY with LIGHT but not
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> > HEAVY with another mass).
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> Right. But HEAVY and LIGHT are not "quantitative measurement". This
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> bring us back to my original question: what is our definition of Quantity?
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>
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> Guys, I feel that before to continue any further in this discussion, we
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> need to write a "Definition of terms" page.
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>
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> Martin
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