R/gl.check.lambda.alt.R

In GLDEX: Fitting Single and Mixture of Generalised Lambda Distributions

"gl.check.lambda.alt" <-
function(l1, l2, l3, l4, param = "fmkl")
{
param <- switch(param,  
fkml = ,
FKML = ,
freimer = ,
frm = ,
FMKL = ,
fmkl = {
ret <- l2 > 0
}
,
ramberg = ,
ram = ,
RS = ,
rs = {
ret <- rep(0, length(l1))
# l2<0
# can also nest some of the items but for clarity, resisted the temptation to do so:
con1 <- (l3 < -1) * (l4 > 1)
con2 <- (l3 > 1) * (l4 < -1)
con3 <- (l4 > 1) * (l3 > -1) * (l3 < 0) * (((1 - l3)^(1 - l3) * (l4 - 1)^(l4 - 1))/
((l4 - l3)^(l4 - l3)) <  - l3/l4)
con4 <- (l3 < 0) * (l4 <= 0)
con5 <- (l3 == 0) * (l4 < 0)
con6 <- (l3 > 1) * (l4 > -1) * (l4 < 0) * (((1 - l4)^(1 - l4) * (l3 - 1)^(l3 - 1))/
((l3 - l4)^(l3 - l4)) <  - l4/l3)
con6[which.na(con6)]<-0
con3[which.na(con3)]<-0

ret[(l2 < 0)] <- ((con1 + con2 + con3 + con4 + con5 + con6) > 0)[(l2 < 0)]
# l2>0
con7 <- (l3 > 0) * (l4 >= 0)
con8 <- (l3 == 0) * (l4 > 0)
ret[l2 > 0] <- (con7+con8)[(l2>0)]
}
)
ret <- as.logical(ret * ((is.finite(l1) * is.finite(l2) * is.finite(l3)* is.finite(l4)) == 1))
return(ret)
}