Hi, got a problem defining variables in cloud.sagemath: http://www.directupload.net/file/d/36...
I just copied the code from http://www.sagemath.org/doc/reference... (the very first line) but I also tried it myself with different letters and '`´". None worked.
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'); x1would 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.
Yup that worked. So I have to be careful not to override given functions?
Exactly. To check if "var" is available, for instance: a cell with
varwill give the following output:
<built-in function var>so you know it is not available.
On the other hand, a cell with
warwill give
NameError: name 'war' is not definedso you know this variable name is available.
Asked: 10 years ago
Seen: 453 times
Last updated: Aug 05 '14
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