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

kevinchang shukai at seas.upenn.edu
Wed Oct 3 17:43:26 CEST 2007

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

XtX<- t(X)%*% X


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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