Trying the example from the doc of phc results in:
sage: from sage.interfaces.phc import phc
sage: R.<x,y> = PolynomialRing(CDF,2)
sage: testsys = [x^2 + 1, x*y - 1]
sage: phc.mixed_volume(testsys)
---------------------------------------------------------------------------
ExceptionPexpect Traceback (most recent call last)
<ipython-input-6-ca20607a9185> in <module>()
----> 1 phc.mixed_volume(testsys)
/home/mueller/local/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/phc.pyc
in mixed_volume(self, polys, verbose)
758 4
759 """
--> 760 output_filename = self._output_from_command_list(['phc
-m','4','n','n','n'], polys, verbose = verbose)
761
762 out = open(output_filename).read()
/home/mueller/local/sage-8.0/local/lib/python2.7/site-packages/sage/interfaces/phc.pyc
in _output_from_command_list(self, command_list, polys, verbose)
452
453 # Create a phc process
--> 454 child_phc = pexpect.spawn(command_list[0])
455 # feed it the commands
456 child_phc.sendline('y')
/home/mueller/local/sage-8.0/local/lib/python2.7/site-packages/pexpect/pty_spawn.pyc
in __init__(self, command, args, timeout, maxread, searchwindowsize,
logfile, cwd, env, ignore_sighup, echo, preexec_fn, encoding, codec_errors,
dimensions)
196 self.name = '<pexpect factory incomplete>'
197 else:
--> 198 self._spawn(command, args, preexec_fn, dimensions)
199
200 def __str__(self):
/home/mueller/local/sage-8.0/local/lib/python2.7/site-packages/pexpect/pty_spawn.pyc
in _spawn(self, command, args, preexec_fn, dimensions)
269 if command_with_path is None:
270 raise ExceptionPexpect('The command was not found or
was not ' +
--> 271 'executable: %s.' % self.command)
272 self.command = command_with_path
273 self.args[0] = self.command
ExceptionPexpect: The command was not found or was not executable: phc.
sage:
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