Sage nb code won't run now: vector.transpose() throws error.

edit

It seems that a vector doesn't know if it is a row or a column vector. When you have a vector such as

 v = vector((uniform(-10,10),uniform(-10,10),uniform(-10,10)))

then

 v.row()

and

 v.column()

give it to you as row or column vectors. This must have been a change made to sage since your notebook was created. So to solve your problem, remove the transpose and relpace it with row or column if necessary.