PeterBurbery/ LinearAlgebraPaclet

A paclet for linear algebra and its applications

Contributed by: Peter Burbery

Installation Instructions

To install this paclet in your Wolfram Language environment, evaluate this code:
PacletInstall["PeterBurbery/LinearAlgebraPaclet"]


To load the code after installation, evaluate this code:
Needs["PeterBurbery`LinearAlgebraPaclet`"]

Details

I used the textbooks Linear Algebra and Its Applications by David C. Lay, Steven R. Lay, and Judi J. McDonald 6th Edition by Pearson to help build this paclet.

Paclet Guide

Examples

Basic Examples (7) 

Determine if an augmented matrix represents a consistent linear system of equations:

In[1]:=
InterpretationBox[FrameBox[TagBox[TooltipBox[PaneBox[GridBox[List[List[GraphicsBox[List[Thickness[0.0025`], List[FaceForm[List[RGBColor[0.9607843137254902`, 0.5058823529411764`, 0.19607843137254902`], Opacity[1.`]]], FilledCurveBox[List[List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3]]], List[List[List[205.`, 22.863691329956055`], List[205.`, 212.31669425964355`], List[246.01799774169922`, 235.99870109558105`], List[369.0710144042969`, 307.0436840057373`], List[369.0710144042969`, 117.59068870544434`], List[205.`, 22.863691329956055`]], List[List[30.928985595703125`, 307.0436840057373`], List[153.98200225830078`, 235.99870109558105`], List[195.`, 212.31669425964355`], List[195.`, 22.863691329956055`], List[30.928985595703125`, 117.59068870544434`], List[30.928985595703125`, 307.0436840057373`]], List[List[200.`, 410.42970085144043`], List[364.0710144042969`, 315.7036876678467`], List[241.01799774169922`, 244.65868949890137`], List[200.`, 220.97669792175293`], List[158.98200225830078`, 244.65868949890137`], List[35.928985595703125`, 315.7036876678467`], List[200.`, 410.42970085144043`]], List[List[376.5710144042969`, 320.03370475769043`], List[202.5`, 420.53370475769043`], List[200.95300006866455`, 421.42667961120605`], List[199.04699993133545`, 421.42667961120605`], List[197.5`, 420.53370475769043`], List[23.428985595703125`, 320.03370475769043`], List[21.882003784179688`, 319.1406993865967`], List[20.928985595703125`, 317.4896984100342`], List[20.928985595703125`, 315.7036876678467`], List[20.928985595703125`, 114.70369529724121`], List[20.928985595703125`, 112.91769218444824`], List[21.882003784179688`, 111.26669120788574`], List[23.428985595703125`, 110.37369346618652`], List[197.5`, 9.87369155883789`], List[198.27300024032593`, 9.426692008972168`], List[199.13700008392334`, 9.203690528869629`], List[200.`, 9.203690528869629`], List[200.86299991607666`, 9.203690528869629`], List[201.72699999809265`, 9.426692008972168`], List[202.5`, 9.87369155883789`], List[376.5710144042969`, 110.37369346618652`], List[378.1179962158203`, 111.26669120788574`], List[379.0710144042969`, 112.91769218444824`], List[379.0710144042969`, 114.70369529724121`], List[379.0710144042969`, 315.7036876678467`], List[379.0710144042969`, 317.4896984100342`], List[378.1179962158203`, 319.1406993865967`], List[376.5710144042969`, 320.03370475769043`]]]]], List[FaceForm[List[RGBColor[0.5529411764705883`, 0.6745098039215687`, 0.8117647058823529`], Opacity[1.`]]], FilledCurveBox[List[List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 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"PeterBurbery`LinearAlgebraPaclet`ConsistentMatrixQ"]], Rule[ShowStringCharacters, True]], "Tooltip"]]], Rule[Background, RGBColor[0.968`, 0.976`, 0.984`]], Rule[BaselinePosition, Baseline], Rule[DefaultBaseStyle, List[]], Rule[FrameMargins, List[List[0, 0], List[1, 1]]], Rule[FrameStyle, RGBColor[0.831`, 0.847`, 0.85`]], Rule[RoundingRadius, 4]], PacletSymbol["PeterBurbery/LinearAlgebraPaclet", "PeterBurbery`LinearAlgebraPaclet`ConsistentMatrixQ"], Rule[Selectable, False], Rule[SelectWithContents, True], Rule[BoxID, "PacletSymbolBox"]][({
   {1, 7, 3, -4},
   {0, 1, -1, 3},
   {0, 0, 0, 1},
   {0, 0, 1, -2}
  })]
Out[1]=

The reduced row echelon form contains a contradiction that 0x1+0x2+0x3=1 so the matrix is not consistent:

In[2]:=
RowReduce[({
    {1, 7, 3, -4},
    {0, 1, -1, 3},
    {0, 0, 0, 1},
    {0, 0, 1, -2}
   })] // MatrixForm
Out[2]=

The solution set is empty. No solutions exist:

In[3]:=
LinearSolve[Map[Most][({
    {1, 7, 3, -4},
    {0, 1, -1, 3},
    {0, 0, 0, 1},
    {0, 0, 1, -2}
   })](*the coefficient matrix*), Map[Last][({
    {1, 7, 3, -4},
    {0, 1, -1, 3},
    {0, 0, 0, 1},
    {0, 0, 1, -2}
   })](*the right most column*)]
Out[3]=
In[4]:=
eqns = {Subscript[x, 1] + 7 Subscript[x, 2] + 3 Subscript[x, 3] == -4,
    Subscript[x, 2] - Subscript[x, 3] == 3, 0 Subscript[x, 1] + 0 Subscript[x, 2] + 0 Subscript[x, 3] == 1, Subscript[x, 3] == -2};
In[5]:=
Solve[eqns, {Subscript[x, 1], Subscript[x, 2], Subscript[x, 3]}]
Out[5]=

The augmented matrix of a linear system is given below. Determine if the system is consistent:

In[6]:=
InterpretationBox[FrameBox[TagBox[TooltipBox[PaneBox[GridBox[List[List[GraphicsBox[List[Thickness[0.0025`], List[FaceForm[List[RGBColor[0.9607843137254902`, 0.5058823529411764`, 0.19607843137254902`], Opacity[1.`]]], FilledCurveBox[List[List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3]]], List[List[List[205.`, 22.863691329956055`], List[205.`, 212.31669425964355`], List[246.01799774169922`, 235.99870109558105`], List[369.0710144042969`, 307.0436840057373`], List[369.0710144042969`, 117.59068870544434`], List[205.`, 22.863691329956055`]], List[List[30.928985595703125`, 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"PeterBurbery`LinearAlgebraPaclet`ConsistentMatrixQ"]], Rule[ShowStringCharacters, True]], "Tooltip"]]], Rule[Background, RGBColor[0.968`, 0.976`, 0.984`]], Rule[BaselinePosition, Baseline], Rule[DefaultBaseStyle, List[]], Rule[FrameMargins, List[List[0, 0], List[1, 1]]], Rule[FrameStyle, RGBColor[0.831`, 0.847`, 0.85`]], Rule[RoundingRadius, 4]], PacletSymbol["PeterBurbery/LinearAlgebraPaclet", "PeterBurbery`LinearAlgebraPaclet`ConsistentMatrixQ"], Rule[Selectable, False], Rule[SelectWithContents, True], Rule[BoxID, "PacletSymbolBox"]][({
   {1, 5, 2, -6},
   {0, 4, -7, 2},
   {0, 0, 5, 0}
  })]
Out[6]=

Do the calculation for the cofactors of a matrix:

In[7]:=
SeedRandom[1];
InterpretationBox[FrameBox[TagBox[TooltipBox[PaneBox[GridBox[List[List[GraphicsBox[List[Thickness[0.0025`], List[FaceForm[List[RGBColor[0.9607843137254902`, 0.5058823529411764`, 0.19607843137254902`], Opacity[1.`]]], FilledCurveBox[List[List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0], List[0, 1, 0]], List[List[0, 2, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3], List[0, 1, 0], List[1, 3, 3]]], List[List[List[205.`, 22.863691329956055`], List[205.`, 212.31669425964355`], List[246.01799774169922`, 235.99870109558105`], List[369.0710144042969`, 307.0436840057373`], List[369.0710144042969`, 117.59068870544434`], List[205.`, 22.863691329956055`]], List[List[30.928985595703125`, 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"PeterBurbery`LinearAlgebraPaclet`CofactorMatrix"]], Rule[ShowStringCharacters, True]], "Tooltip"]]], Rule[Background, RGBColor[0.968`, 0.976`, 0.984`]], Rule[BaselinePosition, Baseline], Rule[DefaultBaseStyle, List[]], Rule[FrameMargins, List[List[0, 0], List[1, 1]]], Rule[FrameStyle, RGBColor[0.831`, 0.847`, 0.85`]], Rule[RoundingRadius, 4]], PacletSymbol["PeterBurbery/LinearAlgebraPaclet", "PeterBurbery`LinearAlgebraPaclet`CofactorMatrix"], Rule[Selectable, False], Rule[SelectWithContents, True], Rule[BoxID, "PacletSymbolBox"]][
  RandomInteger[{-12, 12}, {6, 6}]] // MatrixForm
Out[4]=

Obtain the diagonalized form of a Cauchy matrix:

In[8]:=
CauchyMatrix[{1, 2, 3}, {4, 5, 6}] // MatrixForm
Out[8]=
In[9]:=
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Out[9]=

Some matrices aren't diagonalizable:

In[10]:=
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Out[10]=

Scope (2) 

Out[1]=

Out[1]=

Publisher

Peter Burbery

Compatibility

Wolfram Language Version 13.2

Version History

  • 1.2.0 – 16 December 2022
  • 1.1.0 – 16 December 2022
  • 1.0.0 – 16 December 2022

License Information

MIT License

Paclet Source

Source Metadata

See Also