if you use a constant as a piece in "Piecewise":
sage: f = Piecewise([[(-1,0),0],[(0,pi),sin(x)]])
then you can do anything with this function:
sage: f.default_variable()
...
/home/hassan/Apps/sage-4.2.1/local/lib/python2.6/site-packages/sage/
functions/piecewise.py in default_variable(self)
669 pass
670 for _, fun in self._list:
--> 671 if fun.variables():
672 v = fun.variables()[0]
673 self.__default_variable = v
AttributeError: 'sage.rings.integer.Integer' object has no attribute
'variables'
then I added hasattr(fun, 'variables') to the piecewise line 671 and
that solves the default_variable problem but this time:
sage: f.integral()
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/home/hassan/<ipython console> in <module>()
/home/hassan/Apps/sage-4.2.1/local/lib/python2.6/site-packages/sage/
functions/piecewise.py in integral(self, x, a, b, definite)
788 fun_integrated = fun.integral(x, end, x)
789 else:
--> 790 fun_integrated = fun.integral(x, start, x) +
area
791 if definite or end != infinity:
792 area += fun.integral(x, start, end)
AttributeError: 'sage.rings.integer.Integer' object has no attribute
'integral'
I think that integer ignored in all attributes of piecewise.
and is there any way to use edited code without restarting sage?
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