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#' @rdname woodformation
#' @param dbh1,dbh2 Initial and final diameter at breast height.
#' @param yeardiff Interval between dbh measurements, in years.
#' @param lower,upper Lower and upper bounds for root finding.
woodformation_relativeGrowthRate<-function(dbh1, dbh2, yeardiff, lower = -2, upper = 8){
grow<-function(dbh1, x, ny = 10) {
dbh = dbh1
for(i in 1:ny) {
b <- (dbh/2)^2+dbh*x
if(b<0) return(0)
dbh = 2*sqrt(b)
}
return(dbh)
}
r<-uniroot(function(x) dbh2 - grow(dbh1,x,yeardiff), lower=lower, upper = upper)
return(r$root)
}
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