Nothing
ft2miles <-
function(x) x/5280
miles2ft <-
function(x) x*5280
ft2km <-
function(x) x/3280.839895
km2ft <-
function(x) x*3280.839895
add.alpha <-
function (hex.color.list,alpha) sprintf("%s%02X",hex.color.list,floor(alpha*256))
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