19.test

<<< tex
\begin{bmatrix}
   \dfrac{\partial x_1}{\partial y_1} & \dfrac{\partial x_2}{\partial y_1}
\\ ~
\\ \dfrac{\partial x_1}{\partial y_2} & \dfrac{\partial x_2}{\partial y_2}
\end{bmatrix}

\begin{pmatrix}
   1 & 2 \\
   3 & 4
\end{pmatrix}

\begin{Bmatrix}
   1 & 2 \\
   3 & 4
\end{Bmatrix}

\begin{vmatrix}
   1 & 2 \\
   3 & 4
\end{vmatrix}

\begin{Vmatrix}
   1 & 2 \\
   3 & 4
\end{Vmatrix}


>>> native
[ EDelimited
    "["
    "]"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ])
               ]
             , [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ])
               ]
             ]
           , [ [ ESpace (2 % 9) ] ]
           , [ [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ])
               ]
             , [ EFraction
                   DisplayFrac
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ])
                   (EGrouped
                      [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ])
               ]
             ]
           ])
    ]
, EDelimited
    "("
    ")"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "{"
    "}"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "\8739"
    "\8739"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
, EDelimited
    "\8741"
    "\8741"
    [ Right
        (EArray
           [ AlignCenter , AlignCenter ]
           [ [ [ ENumber "1" ] , [ ENumber "2" ] ]
           , [ [ ENumber "3" ] , [ ENumber "4" ] ]
           ])
    ]
]