[R] Sum of Numeric Values in a DF Column

[Richard M. Heiberger]

## Continuing with your data

AA <- stringr::str_extract_all(dd[[2]],"[[:digit:]]+")
BB <- lapply(AA, as.numeric)
## I think you are looking for one of the following two expressions
sum(unlist(BB))
sapply(BB, sum)


On Mon, Apr 18, 2016 at 12:48 PM, Burhan ul haq <ulhaqz at gmail.com> wrote:
> Hi,
>
> I request help with the following:
>
> INPUT: A data frame where column "Lower" is a character containing numeric
> values (different count or occurrences of numeric values in each row,
> mostly 2)
>
>> dput(dd)
> structure(list(State = c("Alabama", "Alaska", "Arizona", "Arkansas",
> "California"), Lower = c("R 72–33", "R/Coalition 27(23 R, 4 D)–12 D, 1
> Ind.",
> "R 36–24", "R 64–35, 1 Ind.", "D 52–28"), Upper = c("R 26–8, 1 Ind.",
> "R/Coalition 15(14 R, 1 D)–5 D", "R 18–12", "R 24–11", "D 26–14"
> )), .Names = c("State", "Lower", "Upper"), row.names = c(NA,
> 5L), class = "data.frame")
>
> PROBLEM: Need to extract all numeric values and sum them. There are few
> exceptions like row2. But these can be ignored and will be fixed manually
>
> SOLUTION SO FAR:
> str_extract_all(dd[[2]],"[[:digit:]]+"), returns a list of numbers as
> character. I am unable to unlist it, because it mixes them all together, ...
>
> And if I may add, is there a "dplyr" way of doing it ...
>
>
> Thanks
>
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>
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