relmae.R
relmae = function(forecast, forecastbench, true)
{
if (length(forecast) != length(true))
stop("RelMAE: the lengths of input vectors must be the same.")
ferror = mean(abs(true - forecast))
ferrorbench = mean(abs(true - forecastbench))
relativerror = ferror / ferrorbench
return(round(relativerror, 6))
}