solve

["Abderrahim Oulhaj" <abderrahim.oulhaj@pharmacology.oxford.ac.uk>]

Dear all,

 

I  had something bizarre when I tried to get the inverse of the same matrix with S-plus6.2 and R.

 

> A <- matrix(c(613537.28025, -49.536866569,-49.53687, 0.004000337),nrow = 2, byrow=TRUE)

 

With S-plus:

 

> solve(A)

Problem in solve.qr(a): apparently singular matrix
Use traceback() to see the call stack

With R:

 

> solve(a)

             [,1]         [,2]
[1,]   0.00880039     108.9767
[2,] 108.97675704 1349728.0536

Explanation?

 

Abderrahim