[R] mahalanobis distance

[ekinakoglu]

http://www.nabble.com/file/p24569511/mahalanobis.txt mahalanobis.txt 
http://www.nabble.com/file/p24569511/concentrations.txt concentrations.txt 

Dear Forum members,

I have a problem calculating mahalanobis distances. My data file
mahalanobis.txt and categories file concentrations.txt are attached. I do
the following steps:

x <- as.matrix(read.table("mahalanobis.txt", header=TRUE))
y <- as.matrix(read.table("concentrations.txt", header=TRUE))
S <- var(x)
mahalanobis(x,y,S)

and it gives this error:

Error in solve.default(cov, ...) : 
  system is computationally singular: reciprocal condition number =
1.65972e-18

What is wrong? Could you please help me??

Thank you...

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