[R] Help with dplyr

[David Winsemius]

> On Nov 5, 2015, at 3:59 PM, Axel Urbiz <axel.urbiz at gmail.com> wrote:
> 
> Hello, 
> 
> Is there a way to avoid the warning below in dplyr.

There is an option that lets you turn off warnings. There also a wrapper function called, not surprisingly, … `suppressWarnings`. This is all descibed on:

?warning

— 
David.


> I’m performing an operation within groups, and the warning says that the factors created from each group do not have the same levels, and so it coerces the factor to character. I’m using this inside a package I’m developing. I’d appreciate your recommendation on how to handle this.
> 
> library(dplyr)
> 
> set.seed(4)
> df <- data.frame(pred = rnorm(100), models = gl(2, 50, 100, labels = c("model1", "model2")))
> 
> create_bins <- function (pred, nBins) {
>  Breaks <- unique(quantile(pred, probs = seq(0, 1, 1/nBins)))
>  bin <- data.frame(pred = pred, bin = cut(pred, breaks = Breaks, include.lowest = TRUE))
>  bin
> }
> 
> res_dplyr <- df %>% group_by(models) %>% do(create_bins(.$pred, 10))
> Warning message:
>  In rbind_all(out[[1]]) : Unequal factor levels: coercing to character
> 
> Thank you,
> Axel.
> 
> 
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> 
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