$OutputForms

The $OutputForms usage message is shown below.

? $OutputForms

$OutputForms is a list of the formatting functions that get stripped  off when wrapped around the output.

m = MatrixForm[Inverse[{{1, 2, 0}, {0, 2, 3}, {1, 2, -1}}]]

( ) 4 -1 -3 3 1 3 -- - - 2 2 2 1 0 -1

Notice Head[m] returns MatrixForm, but Head[%] retunrs List.

{Head[%], Head[m]}

{List, MatrixForm}


The next cell removes MatrixForm from the list assigned to $OutputForms.

Unprotect[$OutputForms] ;  $OutputForms = Complement[$OutputForms, {MatrixForm}]

{AccountingForm, BaseForm, CForm, DisplayForm, EngineeringForm, FortranForm, FullForm, InputFo ... Shallow, Short, StandardForm, StyleForm, TableForm, TeXForm, TextForm, TraditionalForm, TreeForm}

m = MatrixForm[Inverse[{{1, 2, 0}, {0, 2, 3}, {1, 2, -1}}]]

( ) 4 -1 -3 3 1 3 -- - - 2 2 2 1 0 -1


Now that MatrixForm isn't in the list returned by $OutputForms, we get
MatrixForm for Head[%] and Head[m].

{Head[%], Head[m]}

{MatrixForm, MatrixForm}

The next cell restores the default setting of $OutputForms.

$OutputForms = Union[$OutputForms, {MatrixForm}] ;

Created by Mathematica  (May 16, 2004)

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