Nothing
checkgrades<-function(D1, id=NULL, names=NULL)
{
if(missing(id)) { id = NULL }
if(missing(names)) { names= NULL }
o = order(D1$grades)
DF = data.frame(grades=D1$grades[o], lett=D1$lett[o], scor=D1$scor[o])
if(!is.null(id))
{
DF$id = id[o]
}
if(!is.null(names))
{
DF$name = names[o]
}
print(DF )
}
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