* To convert and simplify units in tables (was:LIterate programming with calc (help))
@ 2022-11-27 19:19 Ypo
2022-12-10 13:51 ` Ihor Radchenko
2022-12-12 9:08 ` To convert and simplify units in tables Fraga, Eric
0 siblings, 2 replies; 4+ messages in thread
From: Ypo @ 2022-11-27 19:19 UTC (permalink / raw)
To: Org-mode
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Hi
I have found an alternative solution to this problem:
> Is it possible to express in a calc block some basic operations with
> variables and non-predefined units?
>
>
> For example, if you wanted to build a code block that calculates how
> much money costs
>
> a land with an Area of 300x300 m^2 at a price of 1 $/m^2.
>
>
> Would it be something like this?
>
> #+begin_src calc
> a = 300 m
> b = 300 m
> Area = a*b
> cost = 1 ($/m^2)
> A*c
>
> #+end_src
>
The alternative way I am trying is using an org-table. It is not
literate programming, but it is a spreadsheet with units ;D
| $ | a = 300 m |
| $ | b = 300 m |
| _ | Area |
| | 90000 m^2 |
| $ | cost = 1 USD/m^2 |
| _ | Payment |
| | 90000 USD |
#+TBLFM: $Area=$a*$b::$Payment=$Area*$cost
(Below "Area" cell it is the result of a*b, and below "Payment" cell it
is the result of Area*cost)
Now, in a more practical case, I have some problems with units:
| $ | E = 2141404.05 kg/cm^2 |
| $ | s_lim = 275 N/mm^2 |
| $ | s_lim = 2800 kg/cm^2 |
| $ | W = 10000 kg |
| $ | l = 65 cm |
| $ | I = 25166 cm^4 |
| $ | Z = 1680 cm^3 |
| _ | s |
| | 386.90476 kg cm / cm^3 |
| _ | cs |
| | 7.2369231 kg cm^3 / (cm^2 kg cm) |
#+TBLFM: $s=$W*$l/$Z::$cs=$s_lim/$s
Below "cs" cell it appears 7.2... and this should be an adimensional
number (no units). Is it possible to simplify those units?
I have tried with:
| $ | E = 2141404.05 kg/cm^2 |
| $ | s_lim = 275 N/mm^2 |
| $ | s_lim = 2800 kg/cm^2 |
| $ | W = 10000 kg |
| $ | l = 65 cm |
| $ | I = 25166 cm^4 |
| $ | Z = 1680 cm^3 |
| _ | s |
| | 386.90476 kg / cm^2 |
| _ | cs |
| | #ERROR |
#+TBLFM: $s=uconvert($W*$l/$Z,kg / cm^2)::$cs=uconvert($s_lim/$s, )
where uconvert is defined as:
(defmath uconvert (v u)
"Convert value V to compatible unit U."
(math-convert-units v u))
But no luck, "cs" result is an ERROR. Is it feasible to get a value for
"cs" with no units?
Best regards
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: To convert and simplify units in tables (was:LIterate programming with calc (help))
2022-11-27 19:19 To convert and simplify units in tables (was:LIterate programming with calc (help)) Ypo
@ 2022-12-10 13:51 ` Ihor Radchenko
2022-12-10 16:04 ` ypuntot
2022-12-12 9:08 ` To convert and simplify units in tables Fraga, Eric
1 sibling, 1 reply; 4+ messages in thread
From: Ihor Radchenko @ 2022-12-10 13:51 UTC (permalink / raw)
To: Ypo; +Cc: Org-mode
Ypo <ypuntot@gmail.com> writes:
> (defmath uconvert (v u)
> "Convert value V to compatible unit U."
> (math-convert-units v u))
>
>
> But no luck, "cs" result is an ERROR. Is it feasible to get a value for
> "cs" with no units?
Note that apart from Calc formula notation, you can use Elisp. That will
avoid all the gotchas Calc has.
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: To convert and simplify units in tables (was:LIterate programming with calc (help))
2022-12-10 13:51 ` Ihor Radchenko
@ 2022-12-10 16:04 ` ypuntot
0 siblings, 0 replies; 4+ messages in thread
From: ypuntot @ 2022-12-10 16:04 UTC (permalink / raw)
To: Ihor Radchenko; +Cc: Org-mode
Hi Ihor.
I'm null at elisp. Could you please refer to me a simple example of math operation and unit simplification in elisp?
Thanks :$
10 dic 2022 14:51:39 Ihor Radchenko <yantar92@posteo.net>:
> Ypo <ypuntot@gmail.com> writes:
>
>> (defmath uconvert (v u)
>> "Convert value V to compatible unit U."
>> (math-convert-units v u))
>>
>>
>> But no luck, "cs" result is an ERROR. Is it feasible to get a value for
>> "cs" with no units?
>
> Note that apart from Calc formula notation, you can use Elisp. That will
> avoid all the gotchas Calc has.
>
> --
> Ihor Radchenko // yantar92,
> Org mode contributor,
> Learn more about Org mode at <https://orgmode.org/>.
> Support Org development at <https://liberapay.com/org-mode>,
> or support my work at <https://liberapay.com/yantar92>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: To convert and simplify units in tables
2022-11-27 19:19 To convert and simplify units in tables (was:LIterate programming with calc (help)) Ypo
2022-12-10 13:51 ` Ihor Radchenko
@ 2022-12-12 9:08 ` Fraga, Eric
1 sibling, 0 replies; 4+ messages in thread
From: Fraga, Eric @ 2022-12-12 9:08 UTC (permalink / raw)
To: Ypo; +Cc: Org-mode
On Sunday, 27 Nov 2022 at 20:19, Ypo wrote:
> The alternative way I am trying is using an org-table. It is not
> literate programming, but it is a spreadsheet with units ;D
> [...]
> Now, in a more practical case, I have some problems with units:
>
> | $ | E = 2141404.05 kg/cm^2 |
> | $ | s_lim = 275 N/mm^2 |
> | $ | s_lim = 2800 kg/cm^2 |
> | $ | W = 10000 kg |
> | $ | l = 65 cm |
> | $ | I = 25166 cm^4 |
> | $ | Z = 1680 cm^3 |
> | _ | s |
> | | 386.90476 kg cm / cm^3 |
> | _ | cs |
> | | 7.2369231 kg cm^3 / (cm^2 kg cm) |
>
> #+TBLFM: $s=$W*$l/$Z::$cs=$s_lim/$s
org tables do have support for units, based on Emacs Calc. You need to
add the "u" option to the formulas for this support. If I change your
formulas to:
#+TBLFM: $cs=$s_lim/$s;u::$s=$W*$l/$Z;u
everything seems to work just fine.
--
: Eric S Fraga, with org release_9.6-14-g53814a in Emacs 30.0.50
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-11-27 19:19 To convert and simplify units in tables (was:LIterate programming with calc (help)) Ypo
2022-12-10 13:51 ` Ihor Radchenko
2022-12-10 16:04 ` ypuntot
2022-12-12 9:08 ` To convert and simplify units in tables Fraga, Eric
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