gnomon_eff <-
function(dx, dy, marks, par=list(a=1, b=4, smark=1)) {
# Gnomonic efficiency functions 1 - b R^a /s
with(as.list(par),
pmax(0, 1 - b * (dx^2 + dy^2)^(a/2) / marks[[smark]])
)
}
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