Class: Matrix3_3

• Inheritance
• Description
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • matrix operations
  • queries

Inheritance:

   Object
   |
   +--Collection
      |
      +--SequenceableCollection
         |
         +--AbstractMultidimensionalArray
            |
            +--AbstractMatrix
               |
               +--Matrix
                  |
                  +--SquareMatrix
                     |
                     +--Matrix3_3

Package:

stx:libbasic2

Category:

Collections-MultiDimensional

Version:

rev: 1.7 date: 2021/03/10 08:46:48

user: cg

file: Matrix3_3.st directory: libbasic2

module: stx stc-classLibrary: libbasic2

Description:

3x3 Matrix (2 dimensions).
Especially useful with the ArrayIndexing-Parser extension.


[instance variables:]

[class variables:]

copyright
COPYRIGHT (c) 2018 by eXept Software AG
             All Rights Reserved

This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice.   This software may not
be provided or otherwise made available to, or used by, any
other person.  No title to or ownership of the software is
hereby transferred.

Class protocol:

 identity

self identity

 new

(comment from inherited method)
return an instance of myself without indexed variables

Instance protocol:

 _at: index1 at: index2

this is a synthetic selector, generated by the compiler,
if a construct of the form expr[idx1][idx2] is parsed.
I.e.
foo[n][m]
generates
foo _at:n at:m

 _at: index1 at: index2 put: value

this is a synthetic selector, generated by the compiler,
if a construct of the form expr[idx1][idx2] := val is parsed.
I.e.
foo[n][m] := val
generates
foo _at:n at:m put:val

 determinantByCofactors

Answer the determinant of this matrix.
See eg. https://textbooks.math.gatech.edu/ila/determinants-cofactors.html

 columns

the number of columns

 rows

the number of rows