bool variables and singular matrix error

[jy03189211]

Currently not supporting the bool variable or any variable contains 0 when calculating the bandwidth or doing matrix inverting, it throws 'LinAlgError: Singular matrix'

while most of the R package does.
Some suggest from https://stackoverflow.com/questions/47710110/linalgerror-singular-matrix

Do you have a plan to add support for bool or categorical variable value with 0

[ljwolf]

I think we should & we can. The commenter is correct in that we should use solve instead of inv nearly always. I also see this as a recapitulation of this older bug

Thanks for raising it, and we'll address it.

[TaylorOshan]

Agreed on using solve, but that older bug was actually a superficial divide-by-zero that has since been removed.