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franciscominajas

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Jul 6th, 2020
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MatLab 0.50 KB | None | 0 0
  1. clc, clear all, close all
  2. %Matriz Gauss Simple
  3. A=[9,21,-12;2,-4,-1;-3,-7,4];
  4. b=[5;6;-3];
  5.  
  6. %Matriz Ampliada
  7. a=[A,b]
  8. det(A) %De acuerdo a esta solución determino qué sistema es
  9.  
  10. %S.I.
  11. %cero en a(2,1)
  12. a(2,:)=a(1,1)*a(2,:)-a(2,1)*a(1,:)
  13.  
  14. %cero en a(3,1)
  15. a(3,:)=a(1,1)*a(3,:)-a(3,1)*a(1,:)
  16.  
  17. %cero en a(3,2)
  18. a(3,:)=a(2,2)*a(3,:)-a(3,2)*a(2,:)
  19.  
  20. %sustitución hacia atrás
  21. z=a(3,4)/a(3,3)
  22. y=(a(2,4)-a(2,3)*z)/a(2,2)
  23. x=(a(1,4)-a(1,3)*z-a(1,2)*y)/a(1,1)
  24.  
  25. %Comprobando
  26. xyz=[x;y;z]
  27. A*xyz
  28. b
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