r - How can I force 'scatter.smooth' to label the x-axis with strings rather than numbers, ordered the way I mean it? -

i experimenting r's scatter.plot , have written following scriptlet:

d <- data.frame(   weekday = rep(c('so', 'mo', 'tu', 'we', 'th', 'fr', 'sa'), 5),   value   = nchar(c(  '##'                 , #  '########'           , # mo  '#############'      , # tu  '######'             , #  '############'       , # th  '###############'    , # fr  '###'                , # sa # ---  '####'               , #  '####'               , # mo  '########'           , # tu  '#####'              , #  '###########'        , # th  '#########'          , # fr  '#####'              , # sa # ---  '####'               , #  '######'             , # mo  '############'       , # tu  '####'               , #  '#############'      , # th  '##########'         , # fr  '###'                , # sa # ---  '#'                  , #  '####'               , # mo  '##############'     , # tu  '####'               , #  '############'       , # th  '##############'     , # fr  '#######'            , # sa # ---  '###'                , #  '######'             , # mo  '###########'        , # tu  '######'             , #  '#############'      , # th  '###########'        , # fr  '####'                 # sa  )) )  scatter.smooth(d$value ~ d$weekday, col=gray(0.7), bty='n') 

this produces following plot:

there 2 problems me: x-axis labeled numbers rather so, mo through sa , numbers seems ordered according alphabetical value of weekday represent (so 1 fr , 7 we).

how can have plot show me weekday labels (so through sa) in order of weekdays?

first you'll want reorder factor levels of weekday (which correctly noticed defaults alphabetical):

d$weekday = factor(d$weekday, levels= c('so', 'mo', 'tu', 'we', 'th', 'fr', 'sa')) 

then you'll want use levels of weekday data replace x-axis's numbers:

scatter.smooth(d$value ~ d$weekday, col=gray(0.7), bty='n', xaxt="n") axis(1, at=1:7, labels = levels(d$weekday)) 

adding xaxt="n" says first not use default number scheme x-axis, axis function places custom labels.