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From: munir <munirpansare@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: pinv
Date: Thu, 5 Nov 2009 09:59:32 -0800 (PST)
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On Nov 5, 8:31 pm, "Steven Lord" <sl...@mathworks.com> wrote:
> "munir" <munirpans...@gmail.com> wrote in message
>
> news:19fa6366-f064-4679-824f-fabe56ce387c@u36g2000prn.googlegroups.com...
>
>
>
>
>
> > On Nov 5, 4:18 am, "ade77 " <ade1...@gmail.com> wrote:
> > > > Error in ==>pinvat 29
> > > > [U,S,V] = svd(A,0);
>
> > > > Error in ==> Untitled17 at 238
> > > > o =pinv(l)
>
> > > can you include the matrix in question
>
> > this is the type of matrix which is singular.it is much smaller than
> > what i ll be using.
> > keeassembly =
> > [ 250*pi*ep33s,            0, 250*pi*ep33s,            0]
> > [            0, 250*pi*ep33a,            0, 250*pi*ep33a]
> > [ 250*pi*ep33s,            0, 250*pi*ep33s,            0]
> > [            0, 250*pi*ep33a,            0, 250*pi*ep33a]
>
> You can't invert this matrix; rows 1 and 3 are identical, as are rows 2 and
> 4.  This means it's not full rank and so has no inverse.  PINVwon't help
> either -- it's intended for numeric matrices, not symbolic matrices.
>
> If you're trying to invert the matrix in order to solve a system of
> equations, DON'T, repeat DO NOT INVERT IT.  Instead use backslash (\) to
> solve the system directly.
>
> --
> Steve Lord
> sl...@mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ

thank u steve. i understand the solution.