The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Matrix is singular and is not supposed to be.
Replies: 4   Last Post: Feb 5, 2013 10:34 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Steven Lord

Posts: 18,038
Registered: 12/7/04
Re: Matrix is singular and is not supposed to be.
Posted: Feb 3, 2013 11:07 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Hugo " <> wrote in message
> Hello, I am trying to obtain deflection results on a beam made with shell
> elements
> I wrote a MATLAB code. The problem is that kk is a matrix with 3000*3000
> full of zeros (it´s a singular matrix), and it is not supposed to be.
> The code runs well until I call the function feasmbl1.m, which is shown
> next


No one will be able to debug this without your data. That means that you're
going to have to be the one to step through your code (ideally on a SMALLER
problem, one that you can work out on paper) to determine why it doesn't
return the results you expect (or determine why your expectations are

I will suggest that you may want to use the ACCUMARRAY or SPARSE functions
to perform your accumulation instead of building your own function.

Steve Lord
To contact Technical Support use the Contact Us link on

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.