# NOT RUN {
n <- 20
m <- lava::lvm(letters)
d <- lava::sim(m,n)
dlist(d,~a+b+c)
dlist(d,~a+b+c|a<0 & b>0)
## listing all :
dlist(d,~a+b+c|a<0 & b>0,n=0)
dlist(d,a+b+c~I(d>0)|a<0 & b>0)
dlist(d,.~I(d>0)|a<0 & b>0)
dlist(d,~a+b+c|a<0 & b>0, nlast=0)
dlist(d,~a+b+c|a<0 & b>0, nfirst=3, nlast=3)
dlist(d,~a+b+c|a<0 & b>0, 1:5)
dlist(d,~a+b+c|a<0 & b>0, -(5:1))
dlist(d,~a+b+c|a<0 & b>0, list(1:5,50:55,-(5:1)))
dprint(d,a+b+c ~ I(d>0) |a<0 & b>0, list(1:5,50:55,-(5:1)))
# }
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