How to change working directory in ob-matlab source block?

How to change working directory in ob-matlab source block?

[stardiviner]

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Is there friend know Emacs Org mode and Matlab here?

I try to save Matlab plot into image file in another path instead of
current working directory. Like
bellowing code:

#+headers: :var cwd=(expand-file-name "data/images/" (file-name-directory
(buffer-file-name)))
#+headers: :prologue "eval(sprintf("cd '%s'", cwd))"
#+headers: :epilogue "saveas(gcf,'matlab-plot-demo2.png'); close(gcf);"
#+begin_src matlab :results graphics file link :dir "data/images" :file
"matlab-plot-demo2.png" :session "*MATLAB*"
bar([1 11 7 8 2 2 9 3 6])
#+end_src

#+RESULTS[(2023-04-13 00:09:01) c5fc0d36b27e75610664ee69ae618649637e45d9]:
[[file:data/images/matlab-plot-demo2.png]]

But Matlab command "cd" does not work correctly in upper code method.

Currently I come up with two solutions:

solution 1

#+begin_src matlab :results graphics file link :file
"data/images/matlab-plot-demo2.png" :session "*MATLAB*" :var
img="data/images/matlab-plot-demo2.png"
bar([1 11 7 8 2 2 9 3 6])
% saveas(gcf, 'data/images/matlab-plot-demo2.png')
% saveas(gcf, img)
disp(img)
close(gcf)
#+end_src

#+RESULTS[(2023-04-13 12:08:35) b87e1d8687e33acc089ea7374829c4d41e3dd0e4]:
[[file:data/images/matlab-plot-demo2.png]]

solution 2

#+headers: :var cwd=(expand-file-name "data/images/" (file-name-directory
(buffer-file-name)))
#+headers: :prologue "eval(sprintf("cd '%s'", cwd))"
#+headers: :epilogue "saveas(gcf,'matlab-plot-demo2.png'); close(gcf);"
#+begin_src matlab :results graphics file link :dir "data/images" :file
"matlab-plot-demo2.png" :session "*MATLAB*"
bar([1 11 7 8 2 2 9 3 6])
#+end_src

#+RESULTS[(2023-04-13 00:09:01) c5fc0d36b27e75610664ee69ae618649637e45d9]:
[[file:data/images/matlab-plot-demo2.png]]

Both does not work.

If you got a workable solution, please help me, Thanks very much.

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[SOLVED] Re: How to change working directory in ob-matlab source block?

[Christopher M. Miles]

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stardiviner <numbchild@gmail.com> writes:

> Is there friend know Emacs Org mode and Matlab here?
>
> I try to save Matlab plot into image file in another path instead of current working directory. Like
> bellowing code:
>
> #+headers: :var cwd=(expand-file-name "data/images/" (file-name-directory (buffer-file-name)))
> #+headers: :prologue "eval(sprintf("cd '%s'", cwd))"
> #+headers: :epilogue "saveas(gcf,'matlab-plot-demo2.png'); close(gcf);"
> #+begin_src matlab :results graphics file link :dir "data/images" :file "matlab-plot-demo2.png" :session
> "*MATLAB*"
> bar([1 11 7 8 2 2 9 3 6])
> #+end_src
>
> #+RESULTS[(2023-04-13 00:09:01) c5fc0d36b27e75610664ee69ae618649637e45d9]:
> [[file:data/images/matlab-plot-demo2.png]]
>
> But Matlab command "cd" does not work correctly in upper code method.
>

I find out the solution. The "cd" command used as a function then pass
in path string as argument. It works fine. So I adopt source block like
this:

#+headers: :var cwd=(expand-file-name "data/images/" (file-name-directory (buffer-file-name)))
#+headers: :prologue "cd(cwd)"
#+begin_src matlab :session "*MATLAB*" :results output
% eval(sprintf("cd '%s'", cwd))
% eval(sprintf("cd('%s')", cwd))
% cd(cwd)

% returns the path to the current working directory.
pwd
#+end_src

#+RESULTS[(2023-04-13 13:20:27) 0c1259b084fc93f95d7c60c9c748a0630bf4391d]:
#+begin_example
cd(cwd)
cwd='/Users/stardiviner/Org/Wiki/Computer Technology/Programming/Emacs/Emacs Packages/Org mode/data/images/';
% eval(sprintf("cd '%s'", cwd))
% eval(sprintf("cd('%s')", cwd))
% cd(cwd)
% returns the path to the current working directory.
pwd

ans =

    '/Users/stardiviner/Org/Wiki/Computer Technology/Programming/Emacs/Emacs Packages/Org mode/data/images'
#+end_example

Really tricky for me. Hope helpful for some user.

-- 

[ stardiviner ]
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