Thank you so much Torsten-3, that's what I was looking for. Now the equation

could be copied directly to octave without modifying it all manually :)

Thank you also Robert Funnell, I didn't know that package, it seems that is

the same as the symbolic calculation in Matlab. However, when I load the

package symbolic, octave gives me this error :

Symbolic pkg v2.7.1: error: Cannot run the Python executable "python"

Try "sympref diagnose" for more information.

error: called from

assert_have_python_and_sympy at line 61 column 7

python_ipc_popen2 at line 79 column 5

python_ipc_driver at line 59 column 13

python_cmd at line 164 column 9

valid_sym_assumptions at line 38 column 10

assumptions at line 82 column 7

syms at line 97 column 13

Doug Stewart-4, I didn't understand your reply, could you please explain

more?

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