Problems with Var in Cloud.Sagemath

Is it possible that you previously evaluated a command defining var as a string? For example,

var = 'x1'

If you did that (and even if you erased that line), then the line

x1 = var('x1'); x1

would produce the exact error that you are seeing.

Try restarting the worksheet (using the orange "Restart" button at the top), this will reset all names, and now the code should execute as expected.

Comments

Yup that worked. So I have to be careful not to override given functions?

Torero ( 2014-08-05 11:48:25 +0100 )edit

Exactly. To check if "var" is available, for instance: a cell with

var

will give the following output:

<built-in function var>

so you know it is not available.

On the other hand, a cell with

war

will give

NameError: name 'war' is not defined

so you know this variable name is available.

slelievre ( 2016-12-05 10:25:59 +0100 )edit

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