Nothing
zeromat=function(nvars,lmu,vnames,stepnames){
ca=rep(0,lmu)
ia=seq(lmu+1)
ja=rep(1,lmu)
dd=c(nvars,lmu)
new("dgCMatrix", Dim = dd,
Dimnames = list(vnames,stepnames),
x = as.vector(ca),
p = as.integer(ia - 1), i = as.integer(ja - 1))
}
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