Re: To convert and simplify units in tables

[Fraga, Eric]

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