2725.sagews

sage.misc.latex.EMBEDDED_MODE = True
nrows = 3
ncols = 2
A = []
for row in range(nrows):
    A.append([])
    for col in range(ncols):
        A[row].append(var('a' + str(row) + str(col)))
A = matrix(A)
ATA = A.transpose()*A

view(ATA)

\newcommand{\Bold}[1]{\mathbf{#1}}\left($$\begin{array}{rr} a_{00}^{2} + a_{10}^{2} + a_{20}^{2} & a_{00} a_{01} + a_{10} a_{11} + a_{20} a_{21} \\ a_{00} a_{01} + a_{10} a_{11} + a_{20} a_{21} & a_{01}^{2} + a_{11}^{2} + a_{21}^{2} \end{array}$$\right)