Am 22.07.2014 10:29, schrieb Dima Pasechnik:
> perhaps a newer qepcad can deal with more things (Sage's qepcad 1.50
> is quite outdated by now). Care to make an update of the corresponding
> spkg?
I have been thinking about it.
As a first step I have built qepcad-B-1.69 and its dependency, the
current saclib-2.2.6 (as static lib), under a clean install of
Linuxmint-17-32bit (a derivative of Ubuntu 14.04 LTS). I could
successfully compute one of the examples from the qepcad website. Then
I have added qepcad to the path.
Now for some reason my sage instance (from sage-6.2-i686-Linux-
Ubuntu_13.04_i686.tar.lzma) still says "RuntimeError: Unable to start
QEPCAD". How can I debug this?
Here is my log:
robert@rpmint32 ~/bin/sage-6.2-i686-Linux $
PATH=$PATH:/home/robert/bin/qepcad-B.1.69/bin
robert@rpmint32 ~/bin/sage-6.2-i686-Linux $ export PATH
robert@rpmint32 ~/bin/sage-6.2-i686-Linux $ which qepcad
/home/robert/bin/qepcad-B.1.69/bin/qepcad
robert@rpmint32 ~/bin/sage-6.2-i686-Linux $ ./sage
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.2, Release Date: 2014-05-06 │
│ Type "notebook()" for the browser-based notebook interface. │
│ Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
sage: qepcad(x^2<4,vars='(x)')
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
<ipython-input-1-40446c40694e> in <module>()
----> 1 qepcad(x**Integer(2)<Integer(4),vars='(x)')
/home/robert/bin/sage-6.2-i686-Linux/local/lib/python2.7/site-packages/sage/interfaces/qepcad.pyc
in qepcad(formula, assume, interact, solution, vars, **kwargs)
1406 use_witness = True
1407
-> 1408 qe = Qepcad(formula, vars=vars, **kwargs)
1409 if assume is not None:
1410 qe.assume(assume)
/home/robert/bin/sage-6.2-i686-Linux/local/lib/python2.7/site-packages/sage/interfaces/qepcad.pyc
in __init__(self, formula, vars, logfile, verbose, memcells, server)
764
765 qex = Qepcad_expect(logfile=logfile)
--> 766 qex._send('[ input from Sage ]')
767 qex._send('(' + ','.join(varlist) + ')')
768 qex._send(str(free_vars))
/home/robert/bin/sage-6.2-i686-Linux/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
in _send(self, cmd)
206 def _send(self, cmd):
207 if self._expect is None:
--> 208 self._start()
209 E = self._expect
210 self.__so_far = ''
/home/robert/bin/sage-6.2-i686-Linux/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
in _start(self, alt_message, block_during_init)
446 self._session_number = BAD_SESSION
447 failed_to_start.append(self.name())
--> 448 raise RuntimeError("Unable to start %s"%self.name())
449 self._expect.timeout = None
450 with gc_disabled():
RuntimeError: Unable to start QEPCAD
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