Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
PeterBurbery`LinearAlgebraPaclet`
CofactorMatrix  |
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Examples
(1)
Basic Examples
(1)
Do the calculation for the cofactors of a matrix:
In[1]:=
SeedRandom[1];
[RandomInteger[{-12,12},{6,6}]]//MatrixForm
 | CofactorMatrix |
Out[1]//MatrixForm=
-140933 | -5255 | 143858 | 420195 | -240107 | 521396 |
-330582 | -391194 | 221805 | 607317 | -787083 | 720267 |
838770 | -17226 | -422697 | -315168 | 724248 | -779073 |
-838249 | -143167 | 104968 | 825861 | -1159873 | 972145 |
389608 | 299821 | 116540 | -484494 | 633013 | -824890 |
273342 | 376338 | -49677 | -552243 | 160272 | -128541 |
Non square matrices don't have cofactors:
In[2]:=
SeedRandom[1];
[RandomInteger[{-12,12},{6,7}]]//MatrixForm
| CofactorMatrix |
Out[2]//MatrixForm=
CofactorMatrix[{{-7,-12,-5,-12,-10,-9,-12},{9,-12,4,11,2,-9,-4},{7,-7,6,4,0,-12,7},{-8,10,9,-5,-9,-12,-8},{8,12,-9,-7,0,7,9},{-4,9,12,-1,-10,-9,-2}}]
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