r - Order Bars in ggplot2 bar graph -


i trying make bar graph largest bar nearest y axis , shortest bar furthest. kind of table have

    name   position 1   james  goalkeeper 2   frank  goalkeeper 3   jean   defense 4   steve  defense 5   john   defense 6   tim    striker

so trying build bar graph show number of players according position

p <- ggplot(thetable, aes(x = position)) + geom_bar(binwidth = 1)

but graph shows goalkeeper bar first defense, , striker one. want graph ordered defense bar closest y axis, goalkeeper one, , striker one. thanks

the key ordering set levels of factor in order want. ordered factor not required; information in ordered factor isn't necessary , if these data being used in statistical model, wrong parametrisation might result — polynomial contrasts aren't right nominal data such this.

## set levels in order want thetable <- within(thetable,                     position <- factor(position,                                        levels=names(sort(table(position),                                                          decreasing=true)))) ## plot ggplot(thetable,aes(x=position))+geom_bar(binwidth=1)

barplot figure

in general sense, need set factor levels in desired order. there multiple ways of doing depending on situation. instance, do:

levels(thetable$position) <- c(...)

and list levels in desired order on right hand side. can specify level order within call factor above:

thetable$position <- factor(thetable$position, levels = c(...))

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