Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

eigen - dsygv

eigen - dsygv

eigen - dsygv


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/f08...), but it is still not clear to me.

thanks for your time,

RE: eigen - dsygv

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

RE: eigen - dsygv

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close