Re: feature request: transpose a table

["Thomas S. Dye" <tsd@tsdye.com>]

On Apr 7, 2010, at 9:52 AM, Michael Brand wrote:

> Hi zwz,
>
> > I do not know if I can do org-plot on rows instead of columns.
> > But today after I finished a table, I found I have to transpose the
> > table by hand so that I can plot it as I want.
> > Here is original table:
> > |  x  | y  | x  | y  | ... |
> > |-----+----+----+----+-----|
> > |   1 |  2 |  3 |  4 |     |
> > |   5 |  6 |  7 |  8 |     |
> > |   9 |  0 |  1 |  2 |     |
> > | ... |    |    |    |     |
> > And I have to convert it into:
> > |   x | y | x | y | x | y | ... |
> > |-----+---+---+---+---+---+-----|
> > |   1 | 2 | 5 | 6 | 9 | 0 |     |
> > |   3 | 4 | 7 | 8 | 1 | 2 |     |
> > | ... |   |   |   |   |   |     |
> >
> > so that every two columns stand for a line.
>
> If someone had trouble to understand like me first, maybe looking  
> also at the last table below with the column groups `<>' could help.
>
> This use case seems quite funny and well suited to be solved with  
> the `field coordinates in formulas' for which I proposed a patch  
> some time ago that is included in org-mode now. Since org-version  
> 6.35 you could try this hack:
>
> step 1) Remove the header and use column editing from Emacs
> http://www.gnu.org/software/emacs/manual/html_node/emacs/Rectangles.html
> to change your original version of the table
>
> | x | y | x | y |
> |---+---+---+---|
> | 1 | 2 | 3 | 4 |
> | 5 | 6 | 7 | 8 |
> | 9 | 0 | 1 | 2 |
>
> to this 3x2 table with Calc vectors in short notation:
>
> #+TBLNAME: FOO
> | [1 2] | [3 4] |
> | [5 6] | [7 8] |
> | [9 0] | [1 2] |
>
> step 2) Transpose the table like described here
> http://orgmode.org/worg/org-hacks.php
> in the section `Transpose a table', currently with this numbering
> http://orgmode.org/worg/org-hacks.php#sec-17.2.3
> to this 2x3 table with the same Calc vectors in the default notation:
>
> | [1, 2] | [5, 6] | [9, 0] |
> | [3, 4] | [7, 8] | [1, 2] |
> #+TBLFM: $1 = remote(FOO, @$#$@#) :: $2 = remote(FOO, @$#$@#) :: $3  
> = remote(FOO, @$#$@#)
>
> step 3) query-replace `['->`', `]'->`', `,'->`|' and add the header  
> manually to get finally this:
>
> |   | x | f.a(x) | x | f.b(x) | x | f.c(x) |
> | / | < |      > | < |      > | < |      > |
> |---+---+--------+---+--------+---+--------|
> |   | 1 |      2 | 5 |      6 | 9 |      0 |
> |   | 3 |      4 | 7 |      8 | 1 |      2 |
>
> > I also wonder how do you guys draw multiple lines in one image,  
> since
> > here there are multiple inds.
>
> I guess you want a xy graph something like this with three lines a,  
> b and c for f.a, f.b and f.c:
>
>  f.n(x)
>   ^
> 08 |      b
> 07 |     b
> 06 |    b
> 05 |
> 04 |  a
> 03 | a
> 02 |*c
> 01 |  ccccc
> 00 +-------cc--> x
>   000000000011
>   012345678901
>
> see
> http://thread.gmane.org/gmane.emacs.orgmode/21979
>
> I assume that this could be done also with org-babel together with R
> http://en.wikipedia.org/wiki/R_%28programming_language%29
> possibly even with your original version of the table...
>
> - Michael


Aloha all,

There is also this code for transposing a table in the Library of Babel:

--------
* Table/Matrix manipulation

Elegant lisp code for transposing a matrix.

#+tblname: transpose-example
| 1 | 2 | 3 |
| 4 | 5 | 6 |

#+srcname: transpose
#+begin_src emacs-lisp :var table=transpose-example
   (apply #'mapcar* #'list table)
#+end_src

#+resname:
| 1 | 4 |
| 2 | 5 |
| 3 | 6 |

----------

All the best,
Tom