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From: ben harper on 23 Feb 2010 18:43
i have a 4x22 matrix.
how can i understand if it's singular?

i tried, "inv" and "det" but the error says that my "matrix is not square"
so how can i find out the singularity?

thank you.
From: Matt Fig on 23 Feb 2010 18:57
For reference:

http://mathworld.wolfram.com/SingularMatrix.html
From: pipa on 23 Feb 2010 19:09
inv is for square matrix only...for rectangular matrices use pinv which provides an answer in least square sense. Not sure if thats what u were looking for...
From: John D'Errico on 23 Feb 2010 19:23
"ben harper" <controlusc(a)gmail.com> wrote in message <hm1p69$orc$1(a)fred.mathworks.com>...
> i have a 4x22 matrix.
> how can i understand if it's singular?
>
> i tried, "inv" and "det" but the error says that my "matrix is not square"
> so how can i find out the singularity?
>
> thank you.

help rank

john
From: ben harper on 24 Feb 2010 02:59
"pipa " <balwindersingh(a)gmail.com> wrote in message <hm1qn1$1s2$1(a)fred.mathworks.com>...
> inv is for square matrix only...for rectangular matrices use pinv which provides an answer in least square sense. Not sure if thats what u were looking for...

thank you very much. this helps.
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