[Sage] create a symbolic matrix

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1. latex(matrix(4,4,list(var('b_%d%d'%(i,j)) for i in range(4) for j in range(4))))

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\[\left(\begin{array}{rrrr}
b_{00} & b_{01} & b_{02} & b_{03} \\
b_{10} & b_{11} & b_{12} & b_{13} \\
b_{20} & b_{21} & b_{22} & b_{23} \\
b_{30} & b_{31} & b_{32} & b_{33}
\end{array}\right)\]