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finding some eigenvalues using eigs

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mim
mim 2013-8-7
关闭： MATLAB Answer Bot 2021-8-20
I want to find eigenvalues of a matrix with size a few thoushands and I know the eigenvalues span through [- big number , + big number]. How can I find just those eigenvalues that they are in an specific range like: [-a , a] with a is known. Matrix is real symmetric. thanks

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David Sanchez
David Sanchez 2013-8-8
I hope it helps:
greater_array = find( my_eigenvalue_array > -a );
wanted_eig_array = find (greater_array < a );

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