JamAndJammies - 1 year ago 63
R Question

# DataTable sorts number by reading left to right in a column

When using the datatable, the numbers are sorted reading from left to right, instead of right to left. I have it converted to numeric too. Why does it do this? See * numbers
It does the same with all columns.

Here's an example: 950 should be the first one, not 96.67

``````Items   RN.2015 RN.2016 Change.RN
London  30      59      **96.67**
Tokyo   2       21      **950**
Paris   2       21      950
Seoul   2       21      950
New York20      39      95
Orlando 18      35      94.44
Nice    3       31      **933.3**
``````

code in reactive:

``````library(dplyr)
fileInfo\$RN <- as.numeric(as.character(fileInfo\$RN))
perChange<-fileInfo %>%
group_by_(input\$selCol)  %>%
summarise(
RN.2015 = sum(RN[Year=="2015"]),
RN.2016 = sum(RN[Year=="2016"])
)%>%
mutate(
Change.RN = delt(RN.2015,RN.2016)
)
``````

function

``````delt <- function(x,y) {ifelse(is.finite((y-x)/x*100),paste0(formatC((y-x)/x*100),"%"),"")}
``````

data:

``````Data <- data.frame(
Items = c("London","Tokyo","Paris","Seoul","New York","Orlando","Nice"),
RN.2015 = c(30,2,2,2,20,18,3),
RN.2016 = c(59,21,21,21,39,35,31)
)
``````

In your function `delt`, `paste0` is returning a character vector, so that column is probably getting converted to character.
Use `str(data)` and ensure that column `Change.RN` is actually a numeric. If not, use `as.numeric` to convert.