[R] Help with dplyr

[Jeff Newmiller]

Yes,  that was my intention, but it appears I may not have read his code carefully enough. 
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Sent from my phone. Please excuse my brevity.

On November 5, 2015 5:23:38 PM PST, David Winsemius <dwinsemius at comcast.net> wrote:
>
>> 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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>> Jeff Newmiller                        The     .....       .....  Go
>Live...
>> DCN:<jdnewmil at dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live
>Go...
>>                                      Live:   OO#.. Dead: OO#.. 
>Playing
>> Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
>> /Software/Embedded Controllers)               .OO#.       .OO#. 
>rocks...1k
>>
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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]]
>>> 
>>> ______________________________________________
>>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>> 
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>David Winsemius
>Alameda, CA, USA