I am using Sage Math installed from the Ubuntu 18.04 LTS repositories
(https://packages.ubuntu.com/search?keywords=sagemath).
I was previously using Sage Math v8.1 installed from source, but when I
upgraded to 18.04 LTS opted for the easier to install and update package.
I'm a bit puzzled because (I think) my previous installation from source
was packaged with FriCAS, but the version from the Ubuntu repositories does
not seem to be packaged with this.
When I try to use the FriCAS interface in the version of Sage Math
installed from the repositories, the following exception occurs:
---------------------------------------------------------------------------TypeError
Traceback (most recent call
last)<ipython-input-1-3651dd5de2cf> in <module>()----> 1 fricas('3 * 5')
/usr/lib/python2.7/dist-packages/sage/interfaces/interface.pyc in
__call__(self, x, name) 280 281 if isinstance(x,
string_types):--> 282 return cls(self, x, name=name) 283
try: 284 return self._coerce_from_special_method(x)
/usr/lib/python2.7/dist-packages/sage/interfaces/expect.pyc in __init__(self,
parent, value, is_name, name) 1386 except (RuntimeError,
ValueError) as x: 1387 self._session_number = -1-> 1388
raise_(TypeError, x, sys.exc_info()[2]) 1389 except
BaseException: 1390 self._session_number = -1
/usr/lib/python2.7/dist-packages/sage/interfaces/expect.pyc in __init__(self,
parent, value, is_name, name) 1381 else: 1382 try:->
1383 self._name = parent._create(value, name=name) 1384
# Convert ValueError and RuntimeError to TypeError for 1385
# coercion to work properly.
/usr/lib/python2.7/dist-packages/sage/interfaces/interface.pyc in _create(self,
value, name) 476 def _create(self, value, name=None): 477
name = self._next_var_name() if name is None else name--> 478
self.set(name, value) 479 return name 480
/usr/lib/python2.7/dist-packages/sage/interfaces/fricas.pyc in set(self, var,
value) 530 """ 531 cmd =
'%s%s%s;'%(var,self._assign_symbol(), value)--> 532 output =
self.eval(cmd, reformat=False) 533 self._check_errors(value, output)
534
/usr/lib/python2.7/dist-packages/sage/interfaces/fricas.pyc in eval(self, code,
strip, synchronize, locals, allow_use_file, split_lines, reformat, **kwds)
752 synchronize=synchronize, locals=locals, 753
allow_use_file=allow_use_file,
split_lines=split_lines,--> 754 **kwds) 755
# we remove carriage returns (\r) to make parsing easier 756 #
they are sent depending on how fricas was invoked:
/usr/lib/python2.7/dist-packages/sage/interfaces/expect.pyc in eval(self, code,
strip, synchronize, locals, allow_use_file, split_lines, **kwds) 1295
elif split_lines: 1296 return
'\n'.join([self._eval_line(L, allow_use_file=allow_use_file, **kwds)-> 1297
for L in code.split('\n') if L != ''])
1298 else: 1299 return
self._eval_line(code, allow_use_file=allow_use_file, **kwds)
/usr/lib/python2.7/dist-packages/sage/interfaces/expect.pyc in _eval_line(self,
line, allow_use_file, wait_for_prompt, restart_if_needed) 905 try:
906 if self._expect is None:--> 907 self._start()
908 E = self._expect 909 try:
/usr/lib/python2.7/dist-packages/sage/interfaces/fricas.pyc in _start(self)
281 # setting the prompt properly is necessary for restarting FriCAS
282 self._prompt = FRICAS_FIRST_PROMPT--> 283
Expect._start(self) 284 for line in FRICAS_INIT_CODE: 285
self.eval(line, reformat=False)
/usr/lib/python2.7/dist-packages/sage/interfaces/expect.pyc in _start(self,
alt_message, block_during_init) 489 # Change pexpect errors
to RuntimeError 490 raise RuntimeError("unable to start %s
because the command %r failed: %s\n%s" %--> 491
(self.name(), cmd, e, self._install_hints())) 492 except
BaseException: 493 self._expect = None
TypeError: unable to start fricas because the command 'fricas -nosman' failed:
The command was not found or was not executable: fricas.
Unfortunately I do not have my previous from-source installation to hand to
test this with.
Should FriCAS be packaged with Sage Math v8.1?
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