World: r3wp

sub suuuuuuuuuuuuuuuub ;-)

like in rebcode

Most operators have prefix only twins (that are called actions). 
Like: equals? is the twin of =

equal?

(without s)

multiply, add, subtract, divide, remainder, lesser?, lesser-or-equal?, 
not-equal?, equal?, strict-equal?, same?, greater?, greater-or-equal?

Geomol: power

beware with same? it's not really a math operator

If you prefer SUB instead of SUBTRACT, just do this in the beginning:

sub: :subtract

ah yes, POWER aslo.

*also*

I think, SAME? is like =?

yes but it's used for serie manipu

or objects, not for maths

>> [a b c] = [a b c]
== true
>> [a b c] == [a b c]
== true
>> [a b c] =? [a b c]
== false

oh my.... you should not bother Kib with same? too early ;-)

lol, he's bright, so he get it.

>> 1 = 1.0  
== true
>> 1 == 1.0
== false

Remember, if you wanna know more about operators like =, == and =?, 
just use ? to ask about them:

>> ? =?

It's fun doing these REBOL School sessions. It helps refresh the 
memories of us more experienced coders. It's hard (impossible) to 
remember all the corners of REBOL.

Geomol: in the last case 1 and 1.0 are different beasts because the 
first is integer and not the other, that's it ?

Can we use complex numbers ?

REBOL is like a little magical mountain lake. It doesn't look much 
on the surface, but it's soo deep.

yes Kib2 but the doc is incomplete, == is also case sensitive
>>"a" = "A"
==true
>>"a" == "A"
==false

kib, yes. == wants both to be same value and same datatype.

kib, you can implement complex numbers as two numbers inside a block.

or should i say, = is not case sensitive

kib, I've made a little library for complex numbers, if you like.

Geomol: I don't need them for starting, but maybe I'll have to use 
them later on. Where is it located ?

http://www.fys.ku.dk/~niclasen/rebol/libs/math/complex.r

Just a little start, and no documentation, so you have to read the 
code to figure it out.

is there something in Rebol.org also ?

Geomol: thanks, no problem for the doc. Reading your code is the 
same.

Geomol: are you the author of the postscript dialect ?

yes

whao...

So i have a difficult question : how do you handle intersection(s) 
between two paths ?

kib2: Note well.  
	either 0 [true][false]  ;== true
	either 1 [true][false]  ;== true

hence:
	either (modulo malong 2) [true][false]  ; == true, always...

kib, :-D
Do you expect me to remember, how postscript works. ;-)
I have to think a bit now ...

ahah

kib, I think, I remember the concept of paths in postscript. Can 
you give an example of such an intersection?

you're like me Geomol, after some months, my memory is garbage collected

LOL yes

I try to remember the really important things, the rest just hit 
the bin.

kib2: you can write:
	either (1 = modulo malong 2) [true][false]

In rebol, 0 is equivalent to true, not to false (as in many other 
languages).

Geomol if your memory works like mine, you only remember process 
and structures not contents

you remember abstract shapes, not data

well, I also remember data. I try to remember the important data.

like the greek alphabet. Doh! ;-)