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edited Nov 2, 2020 at 20:41

The context

Consider the following Emacs configuration

$ cat ~/.emacs.d/init.el (org-babel-do-load-languages 'org-babel-load-languages '((python . t))) $

and the following Org mode file

$ cat ~/Experiments/main.org #+begin_src python :tangle main.py :results file :file 1.png from matplotlib import pyplot x = [1, 2, 3] y = [1, 4, 9] pyplot.plot(x, y) pyplot.savefig('1.png') #+end_src $

If I tangle the Python code block (i.e. execute org-babel-tangle), execute the Python script (i.e. execute python main.py in a shell) and obtain the hash of the resulting image I get

$ pwd /home/myusername/Experiments $ python main.py $ sha512sum 1.png && du -h 1.png 084ffd63ec53665c21fc3eaba5f5ec3622d4d27a97f89cb67e3b436ca8093467272bbc239fd0e60dde27f5207ee33392f5b83b9eca1427efe7523450d92a6a8c 1.png 20K 1.png

I can open 1.png with firefox and mpv without any problems.

If I execute the code block in Emacs by pressing C-c C-c (i.e. execute org-babel-execute-src-block) while the cursor is in the #+BEGIN_SRC block, I get the following

$ sha512sum 1.png && du -h 1.png e39d05b72f25767869d44391919434896bb055772d7969f74472032b03bc18418911f3b0e6dd47ff8f3b2323728225286c3cb36914d28dc7db40bdd786159c0a 1.png 4.0K 1.png

Note that the size of 1.png is significantly lower than the size shown above.

Additional context

In addition to that, if I try to open the image with mpv, I get the following error

$ mpv 1.png (+) Video --vid=1 (png 1.000fps) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%)

An error is also shown when I try to open the image in firefox (see image below)

The error is not present in both firefox and mpv when producing the image 1.png by executing the script in a shell.

The question

Why is the file 1.png obtained after executing org-babel-execute-src-block different than the one produced by tangling the #+BEGIN_SRC block and executing python main.py in a shell?
Why does the resulting file 1.png contain errors?

The context

Consider the following Emacs configuration

$ cat ~/.emacs.d/init.el (org-babel-do-load-languages 'org-babel-load-languages '((python . t)) $

and the following Org mode file

$ cat ~/Experiments/main.org #+begin_src python :tangle main.py :results file :file 1.png from matplotlib import pyplot x = [1, 2, 3] y = [1, 4, 9] pyplot.plot(x, y) pyplot.savefig('1.png') #+end_src $

If I tangle the Python code block (i.e. execute org-babel-tangle), execute the Python script (i.e. execute python main.py in a shell) and obtain the hash of the resulting image I get

$ pwd /home/myusername/Experiments $ python main.py $ sha512sum 1.png && du -h 1.png 084ffd63ec53665c21fc3eaba5f5ec3622d4d27a97f89cb67e3b436ca8093467272bbc239fd0e60dde27f5207ee33392f5b83b9eca1427efe7523450d92a6a8c 1.png 20K 1.png

I can open 1.png with firefox and mpv without any problems.

If I execute the code block in Emacs by pressing C-c C-c (i.e. execute org-babel-execute-src-block) while the cursor is in the #+BEGIN_SRC block, I get the following

$ sha512sum 1.png && du -h 1.png e39d05b72f25767869d44391919434896bb055772d7969f74472032b03bc18418911f3b0e6dd47ff8f3b2323728225286c3cb36914d28dc7db40bdd786159c0a 1.png 4.0K 1.png

Note that the size of 1.png is significantly lower than the size shown above.

Additional context

In addition to that, if I try to open the image with mpv, I get the following error

$ mpv 1.png (+) Video --vid=1 (png 1.000fps) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%)

An error is also shown when I try to open the image in firefox (see image below)

The error is not present in both firefox and mpv when producing the image 1.png by executing the script in a shell.

The question

Why is the file 1.png obtained after executing org-babel-execute-src-block different than the one produced by tangling the #+BEGIN_SRC block and executing python main.py in a shell?
Why does the resulting file 1.png contain errors?

The context

Consider the following Emacs configuration

$ cat ~/.emacs.d/init.el (org-babel-do-load-languages 'org-babel-load-languages '((python . t))) $

and the following Org mode file

$ cat ~/Experiments/main.org #+begin_src python :tangle main.py :results file :file 1.png from matplotlib import pyplot x = [1, 2, 3] y = [1, 4, 9] pyplot.plot(x, y) pyplot.savefig('1.png') #+end_src $

If I tangle the Python code block (i.e. execute org-babel-tangle), execute the Python script (i.e. execute python main.py in a shell) and obtain the hash of the resulting image I get

$ pwd /home/myusername/Experiments $ python main.py $ sha512sum 1.png && du -h 1.png 084ffd63ec53665c21fc3eaba5f5ec3622d4d27a97f89cb67e3b436ca8093467272bbc239fd0e60dde27f5207ee33392f5b83b9eca1427efe7523450d92a6a8c 1.png 20K 1.png

I can open 1.png with firefox and mpv without any problems.

If I execute the code block in Emacs by pressing C-c C-c (i.e. execute org-babel-execute-src-block) while the cursor is in the #+BEGIN_SRC block, I get the following

$ sha512sum 1.png && du -h 1.png e39d05b72f25767869d44391919434896bb055772d7969f74472032b03bc18418911f3b0e6dd47ff8f3b2323728225286c3cb36914d28dc7db40bdd786159c0a 1.png 4.0K 1.png

Note that the size of 1.png is significantly lower than the size shown above.

Additional context

In addition to that, if I try to open the image with mpv, I get the following error

$ mpv 1.png (+) Video --vid=1 (png 1.000fps) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%)

An error is also shown when I try to open the image in firefox (see image below)

The error is not present in both firefox and mpv when producing the image 1.png by executing the script in a shell.

The question

Why is the file 1.png obtained after executing org-babel-execute-src-block different than the one produced by tangling the #+BEGIN_SRC block and executing python main.py in a shell?
Why does the resulting file 1.png contain errors?

Source Link

asked Nov 2, 2020 at 19:55

doltes

Why is the matplotlib plot produced by executing `org-babel-execute-src-block` contain errors?

The context

Consider the following Emacs configuration

$ cat ~/.emacs.d/init.el (org-babel-do-load-languages 'org-babel-load-languages '((python . t)) $

and the following Org mode file

$ cat ~/Experiments/main.org #+begin_src python :tangle main.py :results file :file 1.png from matplotlib import pyplot x = [1, 2, 3] y = [1, 4, 9] pyplot.plot(x, y) pyplot.savefig('1.png') #+end_src $

If I tangle the Python code block (i.e. execute org-babel-tangle), execute the Python script (i.e. execute python main.py in a shell) and obtain the hash of the resulting image I get

$ pwd /home/myusername/Experiments $ python main.py $ sha512sum 1.png && du -h 1.png 084ffd63ec53665c21fc3eaba5f5ec3622d4d27a97f89cb67e3b436ca8093467272bbc239fd0e60dde27f5207ee33392f5b83b9eca1427efe7523450d92a6a8c 1.png 20K 1.png

I can open 1.png with firefox and mpv without any problems.

If I execute the code block in Emacs by pressing C-c C-c (i.e. execute org-babel-execute-src-block) while the cursor is in the #+BEGIN_SRC block, I get the following

$ sha512sum 1.png && du -h 1.png e39d05b72f25767869d44391919434896bb055772d7969f74472032b03bc18418911f3b0e6dd47ff8f3b2323728225286c3cb36914d28dc7db40bdd786159c0a 1.png 4.0K 1.png

Note that the size of 1.png is significantly lower than the size shown above.

Additional context

In addition to that, if I try to open the image with mpv, I get the following error

$ mpv 1.png (+) Video --vid=1 (png 1.000fps) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%) [ffmpeg/video] png: Invalid PNG signature 0x00000000. Error while decoding frame! (Paused) V: 00:00:01 / 00:00:01 (100%)

An error is also shown when I try to open the image in firefox (see image below)

The error is not present in both firefox and mpv when producing the image 1.png by executing the script in a shell.

The question

Why is the file 1.png obtained after executing org-babel-execute-src-block different than the one produced by tangling the #+BEGIN_SRC block and executing python main.py in a shell?
Why does the resulting file 1.png contain errors?