Pass variable or expression into `aes`

Question

I wrote the function to plot bar graph with factor variables. When I run my function,The error message was showed. Error in eval(expr, envir, enclos) : object \'dset\' not f

Answer 1

Converted to an answer, as it seems useful

aes is designed to evaluate unquoted column names within the scope of the provided dataset (dset in your case). dset[, i] is not a column name, rather a whole column which aes wasn't designed to deal with.

Fortunately, you can parse quoted column names to aes_string. Thus, using

aes_string(x = names(dset)[i])

instead of

aes(x = dset[, i])

Should solve your problem