[R] inverse of matrix made by low.tri function

[kevinchang]

Hi all,


I am using R trying to get a inverse matrix of (X^T)X , but I keep getting
the error 
message like: no b argument and no default value for sprintf(gettext(fmt,
domain = domain), ...) .
--------------------------------------------------------------------------------------------
# my code

X<-Matrix(rep(1,500),100,5)
X[lower.tri(X)]<-1-10^-7
XtX<- t(X)%*% X
XtXu<-lu(XtX)
InverseXtX<-solve(XtXu)

---------------------------------------------------------------------------------------------

The cause suggested for this error is that the lower.tri function returns a
matrix of logicals. If so, is trying to fix this by using sprintf function a
good idea ? Or is there is any alternative way to get the inverse matrix?
Please help. Thanks

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