protect(): protection stack overflow

[ghost]

Hello, when I used ranger to build a random forest, there was a problem:Error: protect(): protection stack overflow. My data is 2000 rows, 40000 columns. What can I do?

Thanks for the ranger package, anyway!

[mnwright]

That's usually the formula interface. Try the x/y interface or dependent.variable.name, e.g.

ranger(y = iris[, 5], x = iris[, -5])
or
ranger(dependent.variable.name = "Species", data = iris)

I think the error itself is hard to catch, but we should think about a warning or error if the formula interface is used on data with many columns.

[mnwright]

Warning added in #703.