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Re: [O] [babel] how to pass data to gnuplot from another block
From: |
Nick Dokos |
Subject: |
Re: [O] [babel] how to pass data to gnuplot from another block |
Date: |
Fri, 22 Nov 2013 12:27:50 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
Eric Schulte <address@hidden> writes:
> The attached works fine for me (using sh since I don't have octave).
>
> #+name: uptime
> #+begin_src sh
> paste <(echo -e "1\n5\n15") <(uptime|sed 's/^.*average: //;s/,//g'|tr ' '
> '\n')
> #+end_src
>
Just an fyi: I had to set org-babel-sh-command to "bash" for this to
work. Why is "sh" the default value of this variable?
> #+RESULTS: uptime
> | 1 | 0.02 |
> | 5 | 0.06 |
> | 15 | 0.05 |
>
> #+begin_src gnuplot :var data=uptime :results silent
> set xrange [0:]
> set yrange [0:]
> set title "uptime"
> set xlabel "minutes ago"
> set ylabel "load"
> plot data w lines
> #+end_src
>
> Ensure that the data you're passing into gnuplot is a table and not a
> string. Gnuplot blocks handle tables by writing them to a file, and
> then replacing the variable with the file name. As I recall gnuplot
> blocks assume string data already is a file name, so the variable is
> replaced directly.
>
Ah, that explains everything! I also didn't have octave on this machine
so I wrote a python block. Initially, I had
--8<---------------cut here---------------start------------->8---
#+name: foo
#+begin_src python
x = ((1, 1), (2, 4), (3, 9))
return "\n".join(["|%d | %d |" % (y[0], y[1]) for y in x])
#+end_src
#+RESULTS: foo
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
--8<---------------cut here---------------end--------------->8---
which looks like a table, but isn't: the gnuplot block was blowing
up just like Eric F's. I replaced it with
--8<---------------cut here---------------start------------->8---
#+name: foo
#+begin_src python
x = ((1, 1), (2, 4), (3, 9))
return x
#+end_src
#+RESULTS: foo
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
--8<---------------cut here---------------end--------------->8---
and everything is working. The only problem is that the results
*look* the same, so it's hard to see what the type is.
Nick