Using filter_ in dplyr where both field and value are in variables

Question

I want to filter a dataframe using a field which is defined in a variable, to select a value that is also in a variable. Say I have

df <- data.frame(V=c(6         


        

Answer 1

Following on from LmW; personally I prefer using a dplyr pipeline where the dots are specified before the pipeline so that it is easier to use programmatically, say in a loop of filters.

dots <-  paste0(fld," == '",sval,"'")
df   %>% filter_(.dots = dots)

LmW's example is correct but the values are hardcoded.