Re: [Maxima-discuss] use of subscripts, was: Yamwi (was: Construct sequence of identifiers)

[Richard F. <fa...@gm...>]

dunno about standard, but   just "script" could do.
Scratchpad, many years ago and hence Axiom, now, has display specifications
...

        scripts : (%, List %) -> %  ++ \spad{scripts(f, [sub, super,
presuper, presub])}
                                              ++  creates a form for f
with scripts on all 4 corners.


It also seems to be able to specify alignment...

        supersub : (%, List %) -> %  ++ supersub(a, [sub1, super1,
sub2, super2, ...])
                                            ++ creates a form with
each subscript aligned
                                            ++ under each superscript.



On Sun, Jul 23, 2023 at 3:34 PM Stavros Macrakis <mac...@gm...> wrote:

> I don't think the name matters much.
> There is after all no standard name for a,b,c in x[a,b,c] independent of
> both presentation and semantics. Subscript means that it appears below.
> Index means that it indexes over some set. Then there's Einstein notation,
> tensor contraction, etc.
>
>                 -s
>
> On Sat, Jul 22, 2023 at 12:04 PM Robert Dodier <rob...@gm...>
> wrote:
>
>> On Sat, Jul 22, 2023 at 12:38 AM Wolfgang Hugemann <Au...@hu...>
>> wrote:
>>
>> > Thanks for that hint. But in engineering subscripts are not always meant
>> > as a variable index, but often serve as a means to distinguish
>> quantities.
>> >
>> > If you denote the drag coefficient as c_d
>> > (https://en.wikipedia.org/wiki/Drag_(physics)), you surely don't mean
>> > c[d].
>>
>> Well, Maxima doesn't require subscripts to correspond to indices; instead
>> a more general correspondence is allowed. In fact, subscripts can be any
>> expressions, and there is no requirement that they form a complete set of
>> anything. (Internally values assigned to subscripted variables are stored
>> in a hash table.) In that sense, the subscript does indeed just serve as an
>> indicator to distinguish conceptually-related quantities.
>>
>> Also of interest in this context, a recently-added feature (present in
>> Maxima 5.44 and later) is that one can declare subscripts to be displayed
>> above or below, before or after the base symbol. See
>> declare_index_properties. E.g.:
>>
>> (%i11) declare_index_properties (FOO, [presubscript, presuperscript,
>> postsuperscript, postsubscript]);
>> (%o11)                        done
>> (%i12) FOO[a, b, c, d];
>>                               b   c
>> (%o12)                         FOO
>>                               a   d
>>
>>
>> All the best,
>>
>> Robert
>>
>> PS. I see now that the function is misnamed; it should be called
>> declare_subscript_properties. See, I got myself mixed up ... oh well!
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