Nothing
row.add.mode <- function(lprec, state)
{
if(!missing(state)) {
state <- match.arg(state, choices = c("off", "on")) == "on"
.Call(RlpSolve_set_add_rowmode, lprec, as.logical(state))
}
ifelse(.Call(RlpSolve_is_add_rowmode, lprec), "on", "off")
}
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