eigen - dsygv

rk_19 · Jan 24, 2017

Hi,

i am using fortran to solve an eigen value problem. i am using lapack routine dsygv to solve the eqn of type (Ax=kBx). size of the matrices are 168x168, i am getting 'info' as 170 when i make the run - understand that this should be zero..could some one explain physical meaning of 'info' not equal to zero.. i went through the online manual (

http://www.nag.co.uk/numeric/fl/manual/pdf/F08/f08saf.pdf),

but it is still not clear to me.

thanks for your time,

klaus. · Jan 27, 2017

Well I would say if 'Info' comes back not Zero then there was an error in the subroutine
The number of the Info gives you some hint on what the error might be

If Info = 0 => then all OK, no error

best regards
Klaus

rk_19 · Feb 1, 2017

ok, I sorted it out myself.. if info>n, where n is size of matrix, it is like there is some mismatch in the matrix size declaration.some where in the code, the matrix was not declared properly, so all this happened.

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