Hey, Mat —
So there is an Array datatype in the plugin now, but filter runs are the
only way to create one. TiddlyWiki's filters are (in my mind) the most
natural analog to "cell ranges" in spreadsheet software, so this does make
some sense for the record. That said, there's a strong case for adding
some other ways to define arrays, like an ARRAY(a, b, c) function... It's
also natural that there should be more functions dealing with arrays moving
forward, as the only thing you can do with them right now is compute a sum!
(Excel/Sheets nerds with Opinions, please chime in.)
Some related functions I've been thinking about include a <$for x="0,100">
widget to make it easier to iterate over a series of numbers. (I was also
thinking about how useful it would be to have a timer widget, which either
fires events at an interval or advances a state tiddler's numeric value
over a period of time... This would be sufficient to implement animations,
simulations and self-organizing maps.)
As a conversation piece, here's a quick experiment in SVG animation I did
on my tablet last night:
<$tiddler tiddler="$:/temp/SvgSlider">
<$edit-text tag=Input field=val type=range class=longslider/>
<svg viewBox="-100 -100 200 200" width=400 height=400>
<circle cx=0 cy=0 r=<<formula "100*{{!!val}}%">> style="fill:black;"/>
<circle cx=0 cy=0 r=<<formula "100*{{!!val}}%^3">> style="fill:red;"/>
<circle cx=0 cy=0 r=<<formula "100*{{!!val}}%^4">> style="fill:white;"/>
<$list filter=".1 .2 .3 .4 .5 .6 .7 .8 .9 1" variable=rad>
<$list filter="0 1 2 3 4 5 6 7 8" variable=ori>
<circle
cx=<<formula "<<rad>>*100*{{!!val}}%^1.2*sin(pi*<<ori>
>/4.5+{{!!val}}*.08+<<rad>>)">>
cy=<<formula "<<rad>>*100*{{!!val}}%^1.2*cos(pi*<<ori>
>/4.5+{{!!val}}*.06+<<rad>>+.5)">>
r=<<formula "5*{{!!val}}%^1.5">> style="fill:white;"/>
</$list>
</$list>
</svg>
</$tiddler>
On Friday, 15 December 2017 11:43:28 UTC-6, Mat wrote:
>
> @Evan, as noted; fantastic stuff!!! It's like you've collected several of
> the things people have desired for for several years and solved it in one
> big Ka-Boom!
>
> One that that would be very useful are arrays. It seems Formulas almost
> features this with the *filter output* and e.g the *choose* function
> (more?). TBH, it's not the math aspect I'm personally interested in but
> just that I think it would be easier to work with arrays than with lists as
> they are currently implemented in TW. (As I write this, it sparks an
> idea... that is probably not relevant for your project, but anyway;
> analogous to the ListWidget, an ArrayWidget.)
>
> Thoughts on arrays?
>
> <:-)
>
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