Re: How to input a determinant

• To: mathgroup at smc.vnet.net
• Subject: [mg15941] Re: How to input a determinant
• From: Paul Abbott <paul at physics.uwa.edu.au>
• Date: Wed, 17 Feb 1999 23:34:06 -0500
• Organization: University of Western Australia
• References: <7a28pk\$1nv@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Chee Lim Cheung wrote:

> I was teaching Cramer's rule using Mathematica and one of my students
> asked me how to input a determinant in the traditional way using
> Mathematica. I wish the determinant A of order 2, 3 or higher to appear
> like |A| with the elements enclosed between two vertical bars by the
> side. Is there a clean way to do this in Mathematica?

(under the Cell menu) then this is easily possible. The following
Notebook gives an example of what you are after.

Cheers,
Paul

Notebook[{

Cell[CellGroupData[{
Cell[BoxData[
FormBox[
TagBox[
RowBox[{"\[LeftBracketingBar]",
TagBox[GridBox[{
{"a", "b"},
{"c", "d"}
}],
(TableForm[ #, TableDepth -> 0]&)],
"\[RightBracketingBar]"}],

Cell[BoxData[
\(TraditionalForm\`a\ d - b\ c\)], "Output"]
}, Open  ]],

Cell[BoxData[
FormBox[
RowBox[{
RowBox[{"A", "=",
RowBox[{"(", GridBox[{
{"a", "b"},
{"c", "d"}

Cell[CellGroupData[{

Cell[BoxData[
FormBox[
TagBox[
RowBox[{"\[LeftBracketingBar]",
TagBox["A",
(TableForm[ #, TableDepth -> 0]&)],
"\[RightBracketingBar]"}],

Cell[BoxData[
\(TraditionalForm\`a\ d - b\ c\)], "Output"]
}, Open  ]]
}
]

____________________________________________________________________
Paul Abbott                                   Phone: +61-8-9380-2734
Department of Physics                           Fax: +61-8-9380-1014
The University of Western Australia
Nedlands WA  6907                     mailto:paul at physics.uwa.edu.au
AUSTRALIA                        http://www.physics.uwa.edu.au/~paul

God IS a weakly left-handed dice player
____________________________________________________________________

```

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