Re: Problem with inv function

[Victor Eijkhout]

At 17:10 +0200 2002/09/30, Héctor Garcia Peris wrote:
> Hello,
>
> I am inverting a big matrix (60x60) using the inv function. The 
> result of the inversion is a matrix with the first column with a 
> number in the first row and the rest of the rows with zeros.

Let me guess. The other rows contain really small elements.

Print out the submatrix that you get by leaving out the first row. 
Now are the rows still zero?

>  I have inverted this matrix using other application and the result 
> of the inversion is different, the first column doesn't have zeros 
> in the whole column except the first row. The multiplication of the 
> original matrix by each inverted matrix is the identity matrix,

I hope you see that that is not possible.
--
Victor Eijkhout <address@hidden>
tel: 865 974 9308 (W), 865 673 6998 (H), 865 974 8296 (F)
http://www.cs.utk.edu/~eijkhout/



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