Re: using gnuplot's "splot" and "every" commands on org-mode table data

[Paul Stansell <paulstansell@gmail.com>]

Hi Eric,

There appears to be a slight bug in the way gnuplot handles blocked
data with missing entries.

An example is provided in the org script at then end of this note.

In the code block gnuplot_1 the use of ':missing "?"' seems to cause
the exported data file to lack the blanks lines that are essential
for the plot.  The plot from this code block is incorrect.

In gnuplot_2 ':missing' is not used, but instead 'set datafile missing
"?"' is set explicitly in the gnuplot code block.  The plot from this
code block is correct.

Surely gnuplot_1 should produce exactly the same plot as gnuplot_2.

Kind regards,

Paul


Exported data file does not include blank lines.
#+name: gnuplot_1
#+begin_src gnuplot :var d=block_data_missing :missing "?" :results silent
  set ticslevel 0
  splot d index 0 u 1:2:3 w lp pt 6 ps 5, d index 1 u 1:2:3 w lp pt 6 ps 5
#+end_src

Exported data file includes blank lines.
#+name: gnuplot_2
#+begin_src gnuplot :var d=block_data_missing :results silent
  set datafile missing "?"
  set ticslevel 0
  splot d index 0 u 1:2:3 w lp pt 6 ps 5, d index 1 u 1:2:3 w lp pt 6 ps 5
#+end_src

#+name: block_data_missing
| 1 | 1 |  2 |
| 1 | 2 |  5 |
| 1 | 3 | 10 |
|   |   |    |
| 2 | 1 |  5 |
| 2 | 2 | 10 |
| 2 | 3 | 13 |
|   |   |    |
| 3 | 1 | 10 |
| 3 | 2 |  ? |
| 3 | 3 | 18 |
|   |   |    |
|   |   |    |
| 1 | 1 | 12 |
| 1 | 2 | 15 |
| 1 | 3 | 20 |
|   |   |    |
| 2 | 1 | 15 |
| 2 | 2 | 18 |
| 2 | 3 | 23 |
|   |   |    |
| 3 | 1 |  ? |
| 3 | 2 | 23 |
| 3 | 3 | 28 |