0

I interact with the Gnu Octave's inferior mode and everything seems to be working fine there:

octave> pkg load symbolic
octave> syms x
g = (x+1)/sqrt(x^2 - 1)
simplify(diff(g,x))
octave> g = (sym)

     x + 1   
  ───────────
     ________
    ╱  2     
  ╲╱  x  - 1 

octave> ans = (sym)

          -1         
  ───────────────────
             ________
            ╱  2     
  (x - 1)⋅╲╱  x  - 1 

Now I do the same using org mode and babel where I get an error:

#+begin_src octave :session :eval never-export :results verbatim
pkg load symbolic
syms x
g = (x+1)/sqrt(x^2 - 1)
ans = simplify(diff(g,x))
#+end_src

And when I evaluate the above code, I see the following error in the inferior mode's octave session:

octave> > > error: fprintf: wrong type argument 'class'
error: called from
    dlmwrite at line 195 column 7

Any idea on what I'm doing wrong ?

1
  • I suggest you send a bug report to the Org mode mailing list. – NickD Jan 29 at 17:48
0

So I have found an workaround by playing around with different header arguments. This works for me:

#+begin_src octave :session :eval never-export :results value verbatim output replace
pkg load symbolic
syms x
g = (x+1)/sqrt(x^2 - 1)
ans = simplify(diff(g,x))
#+end_src

#+RESULTS:
#+begin_example

octave> g = (sym)

     x + 1   
  ───────────
     ________
    ╱  2     
  ╲╱  x  - 1
ans = (sym)

          -1         
  ───────────────────
             ________
            ╱  2     
  (x - 1)⋅╲╱  x  - 1
#+end_example
1
  • :results value ... output ... is (or should be) the same as :results ... output ... - the manual says value and output are mutually exclusive, but practically the last one wins. – NickD Jan 30 at 12:42

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