Personally, I usually prefer 1+x instead of >: x, unless the >: serves
some relevant purpose (like if I am defining addition in terms of more
basic operations, or if I'm using an & and don't want parenthesis or
that sort of thing).
I'm not sure, though, if that fits your lesson concept?
Thanks,
--
Raul
On Tue, Dec 8, 2015 at 9:03 AM, Linda A Alvord <lindaalv...@verizon.net> wrote:
> A big idea in Grade 4 is helping students understand fully how base 10
> works. Here is a dialog which might help students to understand number
> systems in general.
>
> So, if you have 64 different colors, how high can you count with unique
> numbers?
>
> Here's the dialog?
>
>
>
> load 'viewmat'
>
> base=: 13 :'(3#y)#:i.y^3'
>
> base 2
>
> sh=: 13 :'(2 1*$y)$,y,"1($y)$>:>./y'
>
> sh base 2
>
> sw=: 13 :'(,|:i.2 3){"1 y,"1($y)$,>:>./y'
>
> sw base 2
>
> s=: 13 :'sw sh y'
>
> s base 2
>
> elz=: 13 :'(>:>./,y)*0=+/\"1 y'
>
> elz base 2
>
> co=: 13 :'s(elz base y)+base y'
>
> [CO2=:co 2
>
> [PAL2=:5 3$255 0 0 0 0 255,9#255
>
> PAL2 viewmat CO2
>
> [PAL3=:6 3$0 255 0 255 0 0 0 0 255,9#255
>
> PAL3 viewmat co 3
>
> rpal=: 13 :'(<:?>:(y,3)$255),3 3$255'
>
> (rpal 3) viewmat co 3
>
> (rpal 4) viewmat co 4
>
> (rpal 5) viewmat co 5
>
>
>
> base NB. number base
>
> sh NB. stretch height
>
> sw NB. stretch width
>
> s NB. stretch both
>
> elz NB. eliminate leading zeros
>
> co NB. count to
>
> rpal NB. random palletes
>
> Linda
>
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