Cast to Expression

expression

asked 2011-04-08 12:02:33 +0100

Ben Reynwar
45 ●3 ●7

How do I cast a number to an Expression?

I would have assumed:

> Expression(0)
Traceback (click to the left of this block for traceback)
...
TypeError: Cannot convert sage.rings.integer.Integer to
sage.structure.parent.Parent

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answered 2011-04-08 12:07:14 +0100

DSM

5242 ●21 ●68 ●112

Yeah, that tripped me up too!

You can do it by calling the parent ring, which in this case is the Symbolic Ring, abbreviated SR:

sage: a = 3
sage: type(a)
<type 'sage.rings.integer.Integer'>
sage: parent(a)
Integer Ring
sage: b = SR(a)
sage: type(b)
<type 'sage.symbolic.expression.Expression'>
sage: parent(b)
Symbolic Ring

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Asked: 2011-04-08 12:02:33 +0100

Seen: 693 times

Last updated: Apr 08 '11

Cast to Expression edit

1 Answer