### Overall error bound of lowest eigenvalue of real symm matrix

Posted:

**Fri May 12, 2006 6:53 pm**Hi,

I'm using dsievx subroutine to calculate the lowest eigenvalue of a real symmetric matrix, and i want to determine if this matrix is definite positive. Time ago i used nag f02bff routine. An alternative procedure is given by using lapack dsievx subroutine, however with this subroutine not overall error bound are obtained. Is there any procedure to obtain this error?

The aim of work is calculate the lowest eigenvalue of a matrix and determine if this is definite positive.

Is there other alternative method to obtain these?

Thanks in advance

I'm using dsievx subroutine to calculate the lowest eigenvalue of a real symmetric matrix, and i want to determine if this matrix is definite positive. Time ago i used nag f02bff routine. An alternative procedure is given by using lapack dsievx subroutine, however with this subroutine not overall error bound are obtained. Is there any procedure to obtain this error?

The aim of work is calculate the lowest eigenvalue of a matrix and determine if this is definite positive.

Is there other alternative method to obtain these?

Thanks in advance