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  1. A = [-2      1      1      0      0      0      0;...
  2.       1  -2002      1   1000   1000      0      0;...
  3.       1      1     -2      0      0      0      0;...
  4.       0   1000      0  -1000      0      1      0;...
  5.       0   1000      0      0  -1000      0      1;...
  6.       0      0      0     -1      0      0      0;...
  7.       0      0      0      0     -1      0      0];
  8.  
  9. detA = det(A)
  10.  
  11. A2 = [-2      1      1;...
  12.       1   -2002      1;... 
  13.       1       1     -2];
  14.  
  15. detA2 = det(A2)
  16.  
  17. A3 = [-3      1      1      0      0      1      0      0;...
  18.        1  -2002      1   1000   1000      0      0      0;...
  19.        1      1     -2      0      0      0      0      0;...
  20.        0   1000      0  -1000      0      0      1      0;...
  21.        0   1000      0      0  -1000      0      0      1;...
  22.        1      0      0      0      0     -1      0      0;...
  23.        0      0      0     -1      0      0      0      0;...
  24.        0      0      0      0     -1      0      0      0];
  25.  
  26. detA3 = det(A3)
Success #stdin #stdout 0.11s 48904KB
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detA = -6000
detA2 = -6000
detA3 =  6000.0
https://ideone.com/q3TCip
language:
Octave (octave 4.4.1)
created:
7 days ago
visibility:
public

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