[R] Help with dplyr

[David Winsemius]

> On Nov 5, 2015, at 4:58 PM, Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
> 
> Solution is to always use the stringsAsFactors=TRUE option in your data.frame() function calls. 

Since that is the default, I’m wondering if you meant to say FALSE?

— 
David.
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> Sent from my phone. Please excuse my brevity.
> 
> On November 5, 2015 3:59:10 PM PST, Axel Urbiz <axel.urbiz at gmail.com> wrote:
>> Hello, 
>> 
>> Is there a way to avoid the warning below in dplyr. 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.
>> 
>> 
>> 	[[alternative HTML version deleted]]
>> 
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> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
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> and provide commented, minimal, self-contained, reproducible code.

David Winsemius
Alameda, CA, USA