Preferences for the Symbolic package.
sympref can set or get various preferences and
configurations. The various choices for cmd and
args are documented below.
Run diagnostics on your system:
sympref diagnose -| ...
Display of syms:
sympref display ⇒ ans = unicode
syms x
sympref display flat
sin(x/2)
⇒ (sym) sin(x/2)
sympref display ascii
sin(x/2)
⇒ (sym)
/x\
sin|-|
\2/
sympref display unicode
sin(x/2)
⇒ (sym)
⎛x⎞
sin⎜─⎟
⎝2⎠
sympref display default
By default, a unicode pretty printer is used to display
symbolic expressions. If that doesn’t work (e.g., if you
see ? characters) then try the ascii option.
Communication mechanism:
sympref ipc ⇒ ans = default
This default depends on your system. If you have loaded the
Pythonic package,
the default will be the native mechanism.
Otherwise, typically the popen2 mechanism will be used,
which uses a pipe to communicate with Python.
If that doesn’t work, try sympref ipc system which is
much slower, as a new Python process is started for each operation.
Other options for sympref ipc include:
sympref ipc popen2: force popen2 choice.
sympref ipc native: use the py interface to
interact directly with an embedded Python interpreter, e.g.,
provided by the Octave Pythonic package.
sympref ipc system: construct a long string of
the command and pass it directly to the python interpreter with
the system() command. This typically assembles a multiline
string for the commands, except on Windows where a long one-line
string is used.
sympref ipc systmpfile: output the python commands
to a file in tempdir and then call that.
For debugging, will not be supported long-term.
sympref ipc sysoneline: put the python commands all
on one line and pass to python -c using a call to system().
For debugging, will not be supported long-term.
Except for native, all of these communication interfaces
depend on the current Python executable, which can be queried:
sympref python ⇒ ans = python
Changing this might help if you’ve installed
a local Python interpreter somewhere else on your system.
The value can be changed by setting the environment variable
PYTHON, which can be configured in the OS, or it can be
set within Octave using:
setenv PYTHON python3
setenv PYTHON ${HOME}/.local/bin/python
setenv PYTHON C:\Python\python.exe
sympref reset
If the environment variable is empty or not set, the package
uses a default setting (often python).
Reset: reset the SymPy communication mechanism. This can be useful after an error occurs and the connection with Python becomes confused.
sympref reset % doctest: +SKIP
Default precision: control the number of digits used by variable-precision arithmetic (see also the ‘digits’ command).
sympref digits % get ⇒ ans = 32 sympref digits 64 % set sympref digits default
Be quiet by minimizing startup and diagnostics messages:
sympref quiet ⇒ ans = 0 sympref quiet on sympref quiet default
Report the version number:
sympref version ⇒ 3.1.1
See also: sym, syms.
Package: symbolic