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Problem with supercripts

asked 2011-01-19 12:01:36 -0600

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I've read that variables can be subscripted with underscore "_" and superscripted with caret "^". However supescripting doesn't seem to work. I think the caret is seen as a power operator. How to work around this?

Subscript example that works:

var('x,y,z_a')
eqn = x == y*z_a
solve(eqn, z_a)

Superscript example that fails:

var('x,y,z^a')
eqn = x == y*z^a
solve(eqn, z^a)
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Comments

Can you let us know where you found that in documentation? That would help us answer this. Caret does indeed mean power, pretty much always in Sage (this is a custom preparsing of Python, where that has a different meaning).

kcrisman gravatar imagekcrisman ( 2011-01-19 12:49:39 -0600 )edit

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answered 2011-01-19 12:53:57 -0600

Although underscores can be used to define new variables

sage: var('x,y,z_a')
(x, y, z_a)
sage: z_a
z_a

"carrots" cannot be used

sage: var('x,y,z^a')
(x, y, z^a)
sage: z^a
Traceback (click to the left of this block for traceback)
...
NameError: name 'z' is not defined

This is because in that last statement, z^a, Sage is looking for a variable called z and trying to exponentiate it with some other variable called a. Note that the symbol ^ is used in Sage for exponentiation. In short, you shouldn't use it to define a new variable.

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Asked: 2011-01-19 12:01:36 -0600

Seen: 595 times

Last updated: Jan 19 '11