Nice example of the issue Bill. Thank you.
Is this a known issue? Plans to be fixed?
Thanks again,
Axel.
> On Nov 2, 2015, at 8:58 PM, William Dunlap wrote:
>
> dplyr::mutate does not collapse factor variables well. They seem to get
> their levels from the levels
> computed for the first gr
dplyr::mutate does not collapse factor variables well. They seem to get
their levels from the levels
computed for the first group and mutate does not check for them having
different levels.
> data.frame(group=rep(c("A","B","C"),each=2),
value=rep(c("X","Y","Z"),3:1)) %>% dplyr::group_by(group) %>
Actually, the results are not the same. Looks like in the code below (see
"using dplyr”), the function create_bins2 is not being applied separately to
each "group_by" variable. That is surprising to me, or I'm misunderstanding
dplyr.
### Create some data
set.seed(4)
df <- data.frame(pred = rno
dplyr::mutate is probably what you want instead of dplyr::summarize:
create_bins3 <- function (xpred, nBins)
{
Breaks <- unique(quantile(xpred, probs = seq(0, 1, 1/nBins)))
bin <- cut(xpred, breaks = Breaks, include.lowest = TRUE)
bin
}
dplyr::group_by(df, models) %>% dplyr::mutate(Bin
The error message is not very helpful and the stack trace is pretty
inscrutable as well
> dplyr::group_by(df, models) %>% dplyr::summarize(create_bins)
Error: not a vector
> traceback()
14: stop(list(message = "not a vector", call = NULL, cppstack = NULL))
13: .Call("dplyr_summarise_impl", PACKAGE
So in this case, "create_bins" returns a vector and I still get the same
error.
create_bins <- function(x, nBins)
{
Breaks <- unique(quantile(x$pred, probs = seq(0, 1, 1/nBins)))
bin <- cut(x$pred, breaks = Breaks, include.lowest = TRUE)
bin
}
### Using dplyr (fails)
nBins = 10
by_group <
You are jumping the gun (your other email did get through) and you are posting
using HTML (which does not come through on the list). Some time (re)reading the
Posting Guide mentioned at the bottom of all emails on this list seems to be in
order.
The error is actually quite clear. You should ret
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