Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

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


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

Topic: Alternative solution for NAN
Replies: 11   Last Post: Feb 27, 2013 5:44 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Tony Kittler

Posts: 105
Registered: 2/5/11
Re: Alternative solution for NAN
Posted: Feb 27, 2013 5:22 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Torsten" wrote in message <kgklbh$6ph$1@newscl01ah.mathworks.com>...
> "Carl S." wrote in message <kgki2g$rie$1@newscl01ah.mathworks.com>...
> > The following code gives NAN (Not a Number) values
> > [U,D]=eig(N);
> >
> > To solve this problem, I wrote that
> > while(det(N) == 0)
> > N=(1e-10.*randi(1,size(N)))*eye(size(N));
> > end
> >
> > But, the loop does not stop

>
> Your matrix N within the loop always has determinant (1e-10)^(size(N))
> which may become very small if N is large.
>
> :( Are there any alternative solution instead of this loop to solve the NAN problem ?
>
> Depends on the original matrix N.
>
> Best wishes
> Torsten.


Dear Torsten,
The matrix N has standard deviation values of grayscale images. So, it changes for each image. How to solve the NAN problem in this case ?



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

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.