#5546: jacobian fails for pynac expressions
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Reporter: burcin | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-3.4.1
Component: symbolics | Keywords:
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Reported by Alex Raichev on sage-support:
{{{
----------------------------------------------------------------------
| Sage Version 3.4, Release Date: 2009-03-11 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: var('x,y', ns=1)
(x, y)
sage: f= x+y
sage: type(f)
<type 'sage.symbolic.expression.Expression'>
sage: jacobian(f,[x,y])
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/Users/arai021/<ipython console> in <module>()
/Applications/sage/local/lib/python2.5/site-packages/sage/calculus/
functions.pyc in jacobian(functions, variables)
136
137 if not isinstance(variables, (tuple, list)) and not
is_Vector(variables):
138 variables = [variables]
139
--> 140 return matrix([[diff(f, v) for v in variables] for f in
functions])
/Applications/sage/local/lib/python2.5/site-packages/sage/calculus/
functional.pyc in derivative(f, *args, **kwds)
145 pass
146 if not isinstance(f, SymbolicExpression):
--> 147 f = SR(f)
148 return f.derivative(*args, **kwds)
149
/Applications/sage/local/lib/python2.5/site-packages/sage/calculus/
calculus.pyc in __call__(self, x)
504 msg, s, pos = err.args
505 raise TypeError, "%s: %s !!! %s" % (msg, s
[:pos], s[pos:])
--> 506 return self._coerce_impl(x)
507
508 def _coerce_impl(self, x):
/Applications/sage/local/lib/python2.5/site-packages/sage/calculus/
calculus.pyc in _coerce_impl(self, x)
566 return self(x._sage_())
567 else:
--> 568 raise TypeError, "cannot coerce type '%s' into a
SymbolicExpression."%type(x)
569
570 def _repr_(self):
TypeError: cannot coerce type '<type
'sage.symbolic.expression.Expression'>' into a SymbolicExpression.
}}}
`sage.symbolic.expression.Expression` doesn't support .derivative(), and
the interface to .diff() doesn't match the Sage conventions.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5546>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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