[R] Inverse Matrices

[Sundar Dorai-Raj]

Looks like A is a singular matrix, hence no inverse. Try det(A) to see
if the determinant is 0 (or close to zero).

If that's not the case, perhaps you can send the actual matrix you're
working with?

Sundar

> -----Original Message-----
> From: owner-r-help at stat.math.ethz.ch 
> [mailto:owner-r-help at stat.math.ethz.ch] On Behalf Of 
> laura at bayesian-bay.freeserve.co.uk
> Sent: Tuesday, November 06, 2001 9:21 AM
> To: r-help at hypatia.math.ethz.ch
> Subject: [R] Inverse Matrices
> 
> 
> I have a problem with finding the inverse of a matrix. I have 
> a square 9x9 matrix, A, and when I do solve(A) to find the 
> inverse I get the following error message:
> 
> Error in solve.default(A) : singular matrix `a' in solve
> 
> Has anybody got any ideas as to why this is happening?
> 
> Thanks 
> 
> Laura Gross
> 
> 
> 
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