#StackBounty: #r #isotonic Bivariate isotonic regression on unbalanced grid

Bounty: 50

I would like to do isotonic regression on bivariate data (that is to say, x with two columns). The function biviso of package Iso is very fast but requires a balanced grid. I would like to do isotonic regression on unbalanced grid. For example:

x1 <- runif(100)
x2 <- runif(100)
y <- x1*x2 + rnorm(100)

Is there an R package or custom R code that can do this?


Get this bounty!!!

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