[R] replace NA into - for specific column

[Jim Lemon]

Hi Kai,
Maybe this will help:

proband_crc2<-data.frame(MMR=rep(c(NA,"+"),3))
proband_crc2
proband_crc2$MMR[is.na(proband_crc2$MMR)]<-"-"
proband_crc2

Jim

On Wed, Jun 2, 2021 at 9:59 AM Kai Yang via R-help <r-help using r-project.org> wrote:
>
> Hi List,
> I have a column MMR in a data frame proband_crc2. The column contents missing value and + (means positive).
> I need to replace all missing value into - (means negative)
> I did try with difference ways.  Below are my testing, but not any one works. Can someone help me?
> Thanks,
> Kai
> proband_crc2 %>% mutate(MMR=recode(MMR, '' = "-"))
> proband_crc2            <- data.frame (ifelse(proband_crc2$MMR !="+", "-", NA))
> proband_crc2$MMR <- ifelse(MMR %in% c(""," ","-"), NA, MMR)
> proband_crc2$MMR[proband_crc2$MMR==NA] <- "-"
> proband_crc2           <- data.frame( proband_crc2 %>% mutate(across(c("MMR"), ~ifelse(.==NA, "-", as.character(.)))))
>
>
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