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Subject: bug#44799: 28.0.50; Calc: Meter not printed as \text in latex output
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Hello,

in Calc, C-u d L to switch to latex language with \text{} printed units.

`min' for example is then printed "\text{min}" but (bug) Meter still
"m".  AFAIU, the printing code assumes that any unit has at least two
characters, which is obviously not the case for some units.

TIA,

Michael.



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Subject: bug#44799: Acknowledgement (28.0.50; Calc: Meter not printed as
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Subject: bug#44799: 28.0.50; Calc: Meter not printed as \text in latex output 
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It seems to be a heuristic for distinguishing units from variables, both =
of which unfortunately have the same representation in Calc. We could =
make it more precise by looking in the unit table (and allow for =
prefixes), but it would mean that a variable 'm' would always look like =
a unit. I'm afraid I have no other good solution at hand.

For that matter, shouldn't units use \mathrm{} rather than \text{} ?

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Subject: bug#44799: 28.0.50; Calc: Meter not printed as \text in latex output
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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
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Date: Sun, 22 Nov 2020 22:12:09 +0100
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Mattias Engdeg=C3=A5rd <mattiase@HIDDEN> writes:

> It seems to be a heuristic for distinguishing units from variables,
> both of which unfortunately have the same representation in Calc. We
> could make it more precise by looking in the unit table (and allow for
> prefixes), but it would mean that a variable 'm' would always look
> like a unit. I'm afraid I have no other good solution at hand.

Ah, so there can be a variable and a unit of the same name at the same
time?  I can s s a variable "m".  Is it good to allow this?  I mean it's
good that meters is "m" as expected but if someone wants to use "m" as a
variable in the same formula it necessarily gets ugly.

> For that matter, shouldn't units use \mathrm{} rather than \text{} ?

I dunno.  latex language mode has several submodes (see
`calc-latex-language'), but none of them uses that.


BTW, do you know (Bug#30231) why allowed characters in units are
restricted?


Thanks,

Michael.

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22 nov. 2020 kl. 22.12 skrev Michael Heerdegen =
<michael_heerdegen@HIDDEN>:

> Ah, so there can be a variable and a unit of the same name at the same
> time?  I can s s a variable "m".  Is it good to allow this?  I mean =
it's
> good that meters is "m" as expected but if someone wants to use "m" as =
a
> variable in the same formula it necessarily gets ugly.

Given the number of units, it seems difficult to disallow using the same =
symbols as variables. Many innocent-looking single-letter names are =
units: s, N, m, A, V, W, J, g, l, ...
For instance, 'e' both has a value (2.7something) and is a unit =
(electron charge).

Variables in Calc include not only names having an assigned concrete =
value, but also variables in the wider mathematical sense since Calc is =
capable of some symbolic computing. Units of measurement just use the =
same mechanism and are treated as any other variables in all computation =
except for operations explicitly related to units such as 'u s'.

A serious reform seems unlikely unless someone really is willing to do =
the work. More realistic might be adding a way to tell Calc which =
variables you want to have typeset as units, as this can vary from =
person to person and time to time.

> BTW, do you know (Bug#30231) why allowed characters in units are
> restricted?

No idea, but isn't it just the restriction of variable symbols in =
general? Unless they already play some syntactic role I suppose we could =
be more permissive. Currency symbols like =E2=82=AC, =C2=A5 and $ appear =
to be of special interest, but $ already has a special meaning.

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Mattias Engdeg=C3=A5rd <mattiase@HIDDEN> writes:

> A serious reform seems unlikely unless someone really is willing to do
> the work. More realistic might be adding a way to tell Calc which
> variables you want to have typeset as units, as this can vary from
> person to person and time to time.

Would it be possible to make output syntax depend on how the symbol is
actually interpreted by Calc in the given context?

> > BTW, do you know (Bug#30231) why allowed characters in units are
> > restricted?
>
> No idea, but isn't it just the restriction of variable symbols in
> general?

You mean, in Calc?  Then I wonder why we have that restriction.


Regards,

Michael.

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