PAIR! and greater-than less-than

[1/5] from: reboler::programmer::net at: 25-Feb-2002 15:02

What's up with the following /CORE console output?

>> 10x20 > 10x25

** Script Error: Expected one of: pair! - not: pair! ** Where: halt-view ** Near: 10x20 > 10x25

>> minimum 10x20 5x25

== 5x20

[2/5] from: chalz:earthlink at: 26-Feb-2002 1:14

I think we've been over this before on this list. Besides, if you look at the output from 'minimum, what it did was return a new PAIR! which contains the minimum values from each half of each given PAIR!. It's basically been decided you can't really compare PAIR! values for greater/less-than, because how do you *define* which is greater and which is less? But 'minimum just takes something like 'minimum AxB CxD and returns ExF, where E is the smaller of A and C, and F is the smaller of B and D. Pretty basic. Not sure, myself, what use it is, but hell, there it is. --Charles

> What's up with the following /CORE console output? > >> 10x20 > 10x25

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[3/5] from: carl:cybercraft at: 26-Feb-2002 19:22

On 26-Feb-02, alan parman wrote:

> What's up with the following /CORE console output? >>> 10x20 > 10x25 > ** Script Error: Expected one of: pair! - not: pair! > ** Where: halt-view > ** Near: 10x20 > 10x25

You can't compare pairs for greater-than or lesser-than in REBOL. The resons why were discussed exaustively on the list recently. If you're looking for a long read, search for "pair" in the escribe archive here... http://www.escribe.com/internet/rebol/ and choose the "Tuples - Was Pair! thread" and "Pair comparison (was: native? :==)" threads.

>>> minimum 10x20 5x25 > == 5x20

That's expected behaviour, and useful too. Gregg Irwin's written a good article on pairs here... http://www.rebolforces.com/articles/pairs1.html which explains it a lot better than I could. Well worth a read. -- Carl Read

[4/5] from: cyphre:seznam:cz at: 26-Feb-2002 11:33

Hi Charles, Carl and all, Just wanted to mention two mezzanine fuctions 'inside? and 'outside? which you could find sometimes very usefull.

>> ? inside?

USAGE: INSIDE? p1 p2 DESCRIPTION: TRUE if both X and Y of the second pair are less than the first. INSIDE? is a function value. ARGUMENTS: p1 -- (Type: pair) p2 -- (Type: pair)

>> ? outside?

USAGE: OUTSIDE? p1 p2 DESCRIPTION: TRUE if either X and Y of the second pair are greater than the first. OUTSIDE? is a function value. ARGUMENTS: p1 -- (Type: pair) p2 -- (Type: pair)

regards, Cyphre

[5/5] from: carl:cybercraft at: 27-Feb-2002 7:55

On 26-Feb-02, Cyphre wrote:

> Hi Charles, Carl and all, > Just wanted to mention two mezzanine fuctions 'inside? and 'outside? > which you could find sometimes very usefull.

Cool. I could've used those a while back. Now why didn't they get a mention in the pair discussions I mentioned? (Though I guess I could've missed it:)

>>> ? inside? > USAGE:

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-- Carl Read

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