[R] Matrix Inversion

From: Wang Chengbin <chengbinw_at_gmail.com>
Date: Wed, 12 Dec 2007 18:59:05 +0800


I got the following error:

a = read.csv("mat.csv")
b = as.matrix(a)
tb = t(b)
bb = tb %*% b
dim(bb)
ibb = solve(bb)
bb %*% ibb

> ibb = solve(bb)

Error in solve.default(bb) :
  system is computationally singular: reciprocal condition number = 1.77573e-19
>

Are there any ways to find more information about why it is singular?

Thanks.



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