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Ashish Raj

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Cornell U

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Professional Interests:
MRI, image reconstructions, image processing

 

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14 Sep 2009 Null space of a sparse matrix calculates null space and range of a rectangular sparse matrix Author: Pawel Kowal

Hi Pawel,
thanks for sharing your code for finding nullspace of large matrices. This appears very useful, and I am considering using it for my research in medical image reconstruction. There is just a small problem, with which I was hoping you could help us.

We are interested in "almost-rank-deficient" matrices rather than strictly rank-deficient. So we want to be able to supply a tolerance parameter which says, "consider all eigenvectors with eigenvalues smaller than this tolerance to belong to the nullspace". My question is: is it possible to add this feature to your code?
I would really appreciate your help!
sincerely,
Ashish Raj

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