From: Jun Inoue <jun.lambda@gmail.com>
To: emacs-orgmode@gnu.org
Subject: Newbie Questions on Spreadsheets
Date: Thu, 19 May 2022 11:13:29 +0900 [thread overview]
Message-ID: <CA+ZA8Qz3SK2WReQtCO9DPa_trXpV-_rk1pdiMB0WoDc9avJqeA@mail.gmail.com> (raw)
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Hi! I've recently started using org mode, and have loved pretty much every
step of it. Thanks for all your work!
I just discovered the power of tables and spreadsheets and started toying
around with it, but there are a few things I can't get to work the way I
want. Would someone please help me out, or tell me if I'm trying to use it
wrong?
1. How do you apply a column formula?
The info manual mentions C-u C-c *, but this doesn't always work. For
example, I have
| $ | | |
| | 2.80 | |
| | 5.53 | |
#+TBLFM: $3=$2
and typing C-u C-c * inside the table changes nothing. If I remove the $
cell the C-u C-c * does update the whole table, so could it be a bug in the
handling of $?
2. Is there a way to move/delete columns and rows without screwing up
formulas?
While minimizing the example above, I deleted a bunch of columns from a
larger table using org-table-delete-column, only to find that the formulas
are not updated, so they become dangling references or reference the wrong
columns. Same for rows, or moving them with e.g. org-metadown. Is there a
way to have the formulas update as I restructure the table?
3. Formatting directives seem to take the numerators of rationals.
For example, if I hit C-c C-c in
| 5:6 | :=@1$1;%.2f |
I get
| 5:6 | 5.00 |
#+TBLFM: @1$2=@1$1;%.2f
whereas I would have expected the last column to be 0.17. It seems that %f
directives take the numerators of ratios, but I would have expected it to
coerce to the closest floating point instead. (It doesn't make sense to
me: when would you /want/ to drop the denominator?) I know I can coerce
manually with float(), but counting on myself to insert that every time
sounds like a mistake waiting to happen.
Is there a way to customize it so that ratios are converted to float by the
%f directive, rather than having its denominator thrown away?
4. Is there a way to combine concise display with high-precision
calculations?
I prefer floating point to be formatted concisely, like %.2f, to avoid
visual clutter and to keep column sizes manageable (especially since I use
visual-line-mode). But if I put %.2f everywhere, I quickly run into
precision issues. For example:
| :=2/3;%.2f | := @1$1+@1$1 | :=@1$2 + @1$2 + @1$2 |
Evaluating these formulas gives
| 0.67 | 1.34 | 4.02 |
#+TBLFM: @1$1=2/3;%.2f::@1$2=@1$1+@1$1::@1$3=@1$2 + @1$2 + @1$2
The calculation is cut off at two decimal places. Full-blown spreadsheet
software usually separates the internal data representation from the
formatting, so that formatting doesn't affect precision. Is there a way to
achieve a similar effect, or is that difficult given how org-mode tables
keep all the data as explicit text?
BTW, I'm using Org mode 9.5.2 with Emacs 28.1 on macOS (so-called
Mitsuharu's mac-port).
--
Jun Inoue
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next reply other threads:[~2022-05-19 2:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-19 2:13 Jun Inoue [this message]
2022-05-19 13:45 ` Newbie Questions on Spreadsheets Quiliro Ordóñez
2022-05-19 23:14 ` Jun Inoue
2022-05-20 0:37 ` Quiliro Ordóñez
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