Pandas printing in jupyter

[boffi at pentangle.appreciation.net]

boffi at questa.la.so writes:

> def prmat(mat):
>     return (r'\begin{bmatrix}' +
>             r'\\'.join('&'.join('%f'%x for x in row) for row in mat) +
>             r'\end{bmatrix}'
add a closing parenthesis here ^