How can i correct this error ?

3 vues (au cours des 30 derniers jours)
Mallouli Marwa
Mallouli Marwa le 1 Sep 2016
Commenté : Star Strider le 1 Sep 2016
Hi
In my program, i use the function eig to return the eigenvalues :
[V,D]=eig(k,m);
But i have obtained this error:
Error using eig
EIG does not support generalized eigenproblem EIG(A,B) when A or B is sparse.
Please help me.
  2 commentaires
Adam
Adam le 1 Sep 2016
Clearly you need to give us more information on k and m. Judging from the error messages though it seems clear that one of your two inputs, k or m, are sparse matrices and these are not supported by Eig.
Mallouli Marwa
Mallouli Marwa le 1 Sep 2016

m=

   (1,1)                0.00075602592
   (3,1)                0.00013085064
   (4,1)              -8.00127432e-07
   (2,2)            1.25066072448e-08
   (3,2)               8.00127432e-07
   (4,2)            -4.6899777168e-09
   (1,3)                0.00013085064
   (2,3)               8.00127432e-07
   (3,3)                0.00037801296
   (4,3)             -1.354061808e-06
   (1,4)              -8.00127432e-07
   (2,4)            -4.6899777168e-09
   (3,4)             -1.354061808e-06
   (4,4)             6.2533036224e-09

And, k=

   (1,1)             28834278.0744617
   (3,1)            -14417139.0372308
   (4,1)             183097.665772832
   (2,2)             6200.90761417323
   (3,2)            -183097.665772832
   (4,2)             1550.22690354331
   (1,3)            -14417139.0372308
   (2,3)            -183097.665772832
   (3,3)             14417139.0372308
   (4,3)            -183097.665772832
   (1,4)             183097.665772832
   (2,4)             1550.22690354331
   (3,4)            -183097.665772832
   (4,4)             3100.45380708661

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Réponse acceptée

Star Strider
Star Strider le 1 Sep 2016
According to the sparse matrix section of the documentation, you need to use the eigs function.
  2 commentaires
Mallouli Marwa
Mallouli Marwa le 1 Sep 2016
Have they the same result ?
Star Strider
Star Strider le 1 Sep 2016
They seem to, but the results of eig are ordered opposite those of eigs. The eigs funciton works with sparse matrices, while eig does not.
Check them with something like this example (not using sparse matrix arguments):
A = randi([-9 9], 5);
[V1,D1] = eig(A)
[V2,D2] = eigs(A)

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