From: Ypo <ypuntot@gmail.com>
To: Org-mode <emacs-orgmode@gnu.org>
Subject: To convert and simplify units in tables (was:LIterate programming with calc (help))
Date: Sun, 27 Nov 2022 20:19:42 +0100 [thread overview]
Message-ID: <2ff2b255-029d-c0f4-6102-0e4482b53b63@gmail.com> (raw)
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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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next reply other threads:[~2022-11-27 19:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-27 19:19 Ypo [this message]
2022-12-10 13:51 ` To convert and simplify units in tables (was:LIterate programming with calc (help)) Ihor Radchenko
2022-12-10 16:04 ` ypuntot
2022-12-12 9:08 ` To convert and simplify units in tables Fraga, Eric
-- strict thread matches above, loose matches on Subject: below --
2022-11-28 18:58 To convert and simplify units in tables (was:LIterate programming with calc (help)) Ypo
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