r - add a column in data table using for loop -


i have data.table called md looks this

group_1 group_2       b       b       b c       c

i use following code: groups <- c("group_1","group_2") 

    (group in groups)     {      md[!get(group)=="a",get(group):="b"]      md[,get(group):=factor(x = get(group),levels = c("a","b"),ordered = t)]     }

so want both columns in data.table if value every row not "a" replace value "b" , add ordered levels it.

but error error in get(group): object 'group_1' not found

any ideas ?

another option using set

 for(group in groups){    set(md, = which(md[[group]] !='a'), j = group, value = 'b')     set(md, = null, j = group, value = factor(md[[group]], levels = c('a', 'b'),       ordered = true)) } md #    group_1 group_2 #1:             #2:       b       #3:       b       b #4:       b       b

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