Adding captions and attributes to figures and tables from code blocks in org-mode

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I have wanted for a long time to be able to add captions and attributes to figures and tables generated from code blocks. I brought this up on the mailing list (https://lists.gnu.org/archive/html/emacs-orgmode/2015-11/msg00544.html ) and finally, I have figured out a way to do it that seems ok. It is based on the :wrap feature of org-babel.

The idea is to use a function that will wrap the results in additional text. We use this function that will add a caption and attributes.

(defun src-decorate (&optional caption attributes)
  "A wrap function for src blocks."
  (concat
   "ORG\n"
   (when attributes
     (concat (mapconcat 'identity attributes "\n") "\n"))
   (when caption
     (format "#+caption: %s" caption))))
src-decorate

Now, we try it out on a figure:

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 2 * np.pi)
y = np.sin(x)

plt.plot(x, y)
plt.savefig('images/sin.png')
print('[[./images/sin.png' + ']]')

Figure 1: A sin wave.

Success. We can even refer to Fig. fig-sin. Next, we try it on a table.

import numpy as np

x = np.linspace(0, 2 * np.pi, 5)
y = np.sin(x)

return [['x', 'y'], None] + list(zip(x, y))
Table 1: A table of sin data.
x y
0.0 0.0
1.5707963267948966 1.0
3.141592653589793 1.2246467991473532e-16
4.71238898038469 -1.0
6.283185307179586 -2.4492935982947064e-16

Sweet. We can refer to Tab. tab-sin too. I have wanted this for a long time. Perseverance wins again! and org-mode gets better. Hopefully this works with org 8.3 too!

Copyright (C) 2016 by John Kitchin. See the License for information about copying.

org-mode source

Org-mode version = 8.2.10

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