How can i correct this error ?

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Mallouli Marwa
Mallouli Marwa 2016-9-1
评论： Star Strider 2016-9-1
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 个评论
Adam
Adam 2016-9-1
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 2016-9-1

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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采纳的回答

Star Strider
Star Strider 2016-9-1
According to the sparse matrix section of the documentation, you need to use the eigs function.
  2 个评论
Mallouli Marwa
Mallouli Marwa 2016-9-1
Have they the same result ?
Star Strider
Star Strider 2016-9-1
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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