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Re: [O] Output result of source block to a file

From: Roger Mason
Subject: Re: [O] Output result of source block to a file
Date: Sat, 08 Jun 2019 08:21:59 -0230
User-agent: mu4e 1.1.0; emacs 26.1

Hello John,

John Kitchin <address@hidden> writes:

> you probably figured out the "import io" and "f = io..." line are not
> necessary here.


> I couldn't figure out a reasonable way to use :results graphics link
> that didn't result in repeating the filename more than desired. These
> also both work, but seem to both require repeating the filename twice.
> #+BEGIN_SRC python :results graphics link :var fname="test.png" :file 
> "test.png"
> import matplotlib.pyplot as plt
> plt.plot([1, 2, 3, 1])
> plt.savefig(fname)
> #+BEGIN_SRC python :results graphics link :file "test.png"
> import matplotlib.pyplot as plt
> plt.plot([1, 2, 3])
> plt.savefig("test.png")
> Something like this should work, but there seem to be some extra bytes
> getting put in the png file from the decoding, and latin-1 is the only
> one I can get to work. If anyone knows how to get this to work, I am
> interested in seeing it!
> #+BEGIN_SRC python :results value :file "io.png"
> import matplotlib.pyplot as plt
> import io
> buf = io.BytesIO()
> plt.plot([1, 2, 3])
> plt.savefig(buf, format='png')
> s = buf.getvalue()
> return s.decode('latin-1')
> In general though, all of these are much more work than using
> ob-ipython, which just puts images in the buffer for you.

I will investigate that, thanks for the tip.  I began this bit of work
using gnuplot for making x-y plots, but I find that gnuplot syntax gets
messy for anything but simple data.  I am not a particular fan
of python so I'm also looking into guile & racket for plotting.

Thanks for your help, it is much appreciated.


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