r - How to use a variable to specify column name in ggplot -


i have ggplot command

ggplot( rates.by.groups, aes(x=name, y=rate, colour=majr, group=majr) )

inside function. able use parameter of function pick out column use colour , group. i.e. this

f <- function( column ) {     ...     ggplot( rates.by.groups, aes(x=name, y=rate, colour= ??? , group=??? ) ) }

so column used in ggplot determined parameter. e.g. f("majr") effect of

ggplot( rates.by.groups, aes(x=name, y=rate, colour=majr, group=majr) )

but f("gender") effect of

  ggplot( rates.by.groups, aes(x=name, y=rate, colour=gender, group=gender) )

some things tried:

ggplot( rates.by.groups, aes(x=name, y=rate, colour= columnname , group=columnname ) )

did not work. nor did 

e <- environment()  ggplot( rates.by.groups, aes(x=name, y=rate, colour= columnname , group=columnname ), environment=e )

you can use aes_string:

f <- function( column ) {     ...     ggplot( rates.by.groups, aes_string(x="name", y="rate", colour= column,                                         group=column ) ) }

as long pass column function string (f("majr") rather f(majr)). note changed other columns, "name" , "rate", strings.

if whatever reason you'd rather not use aes_string, change (the more cumbersome):

    ggplot( rates.by.groups, aes(x=name, y=rate, colour= get(column),                                         group=get(column) ) )

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