1 | initial version |
There are two errors in your code.
First: you define variables a,b,c , that's ok, but you use strings in the list of vector entries.
Second: a,b,c are elements of the symbolic ring and cannot be converted to elements of QQ
sage: a,b,c=var("a,b,c");v = vector([a,b,c]);v
(a,b,c)