May want to add headers but the following provides the device number with
each set fo sums:
for (dev in (unique(md$device)))
{cat(colSums(subset(md,md$device==dev)==5,na.rm=T),dev,"\n")}
Clint Bowman INTERNET: cl...@ecy.wa.gov
Air Quality Modeler INTERNET: cl...@math.utah.edu
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On Tue, 16 Jun 2015, Dimitri Liakhovitski wrote:
Except, of course, Bert, that you forgot that it had to be done by
device. Your solution ignores the device.
md <- data.frame(a = c(3,5,4,5,3,5), b = c(5,5,5,4,4,1), c = c(1,3,4,3,5,5),
device = c(1,1,2,2,3,3))
myvars = c("a", "b", "c")
md[2,3] <- NA
md[4,1] <- NA
md
vapply(md[myvars], function(x) sum(x==5,na.rm=TRUE),1L)
But the result should be by device.
On Tue, Jun 16, 2015 at 1:56 PM, Dimitri Liakhovitski
<dimitri.liakhovit...@gmail.com> wrote:
Thank you, Bert.
I'll be honest - I am just learning dplyr and was wondering if one
could do it in dplyr.
But of course your solution is perfect...
On Tue, Jun 16, 2015 at 1:50 PM, Bert Gunter <bgunter.4...@gmail.com> wrote:
Well, dplyr seems a bit of overkill as it's so simple with plain old
vapply() in base R :
dat <- data.frame (a=sample(1:5,10,rep=TRUE),
+ b=sample(3:7,10,rep=TRUE),
+ g = sample(7:9,10,rep=TRUE))
vapply(dat,function(x)sum(x==5,na.rm=TRUE),1L)
a b g
5 4 0
Cheers,
Bert
Bert Gunter
"Data is not information. Information is not knowledge. And knowledge is
certainly not wisdom."
-- Clifford Stoll
On Tue, Jun 16, 2015 at 10:24 AM, Dimitri Liakhovitski
<dimitri.liakhovit...@gmail.com> wrote:
Hello!
I have a data frame:
md <- data.frame(a = c(3,5,4,5,3,5), b = c(5,5,5,4,4,1), c =
c(1,3,4,3,5,5),
device = c(1,1,2,2,3,3))
myvars = c("a", "b", "c")
md[2,3] <- NA
md[4,1] <- NA
md
I want to count number of 5s in each column - by device. I can do it like
this:
library(dplyr)
group_by(md, device) %>%
summarise(counts.a = sum(a==5, na.rm = T),
counts.b = sum(b==5, na.rm = T),
counts.c = sum(c==5, na.rm = T))
However, in real life I'll have tons of variables (the length of
'myvars' can be very large) - so that I can't specify those counts.a,
counts.b, etc. manually - dozens of times.
Does dplyr allow to run the count of 5s on all 'myvars' columns at once?
--
Dimitri Liakhovitski
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--
Dimitri Liakhovitski
--
Dimitri Liakhovitski
______________________________________________
R-help@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.
______________________________________________
R-help@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.
