FEAP User Forum

FEAP => General questions => Topic started by: Ziyu on July 01, 2013, 02:31:00 PM

Title: Condition check?
Post by: Ziyu on July 01, 2013, 02:31:00 PM

Dear FEAP developers,

I saw in the output file that some information about condition check is printed every time after tang/utang command is issued. I just want to confirm with you the exact meaning of D-max and D-min. Are they the max/min eigenvalues of the stiffness matrix?

Best,

Ziyu

Title: Re: Condition check?
Post by: FEAP_Admin on July 01, 2013, 09:57:23 PM

D-min and D-max are the min and max values seen on the (reduced) diagonal during the factorization process.
This is in way related to the max and min eigenvalues and their ratio is related to the number of digits lost during the computation.