mysql - How to use the value of a variable as the name of an array in R -

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i starting rscript commandargs(true , variable <- args[1].

in variable name of column of mysql database. select column dynamically , query rohdaten <- dbgetquery(con, sql)

the result array. want this:

rohdaten$xxx[rohdaten$xxx==null]<-na xxx value of variable

how can set xxx value of variable? tried many things variations of rohdaten$get(variable)

instead of calling

rohdaten$xxx

try 

rohdaten[variable]

this translate whatever variable is, e.g.

rohdaten["columnname"]

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