If I assign a symbolic expression to a variable, how do I clear the assignment as if I didn't assign anything to it in the first place?
For example,
sage: var('a,b')
(a, b)
sage: x=a+b
sage: x
a + b
sage: var(x)
a + b
sage: x
a + b
sage: x=x
sage: x
a + b
Here, I assigned a+b to x. But I can't 'unassign' it.
In Mathematica this can be done with Clear[x].
Thanks.
The reset command may do what you want.
sage: var('a,b')
(a, b)
sage: x = a+b
sage: x
a + b
sage: reset('x')
sage: x
x
See the answer to your previous question at http://ask.sagemath.org/question/597/difference-between-varx-and-xvarx - I think that is the best explanation.
Another possibility is to use Python's del to delete an object:
sage: del x
sage: x
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/home/vbraun/opt/sage-4.7.1.alpha2/local/include/singular/<ipython console> in <module>()
NameError: name 'x' is not defined
sage: x = var('x')
sage: x
x
Asked: 2011-06-20 16:46:38 +0100
Seen: 15,031 times
Last updated: Jun 21 '11
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