r - How to order multiple plots through facet_wrap in ggplot2 -


i have dataset following one, , have 1 million rows this:

orderid     prodid      priceperitem    date        category_eng     3010419     2   62420       18.90   2014-10-09      roll toliet paper

i plotting plot of these products scatterplots using priceperitem y-axis , date x-axis. have ordered these rows based on these products' coefficient of variation of prices throughout time. have summarized these results in dataset following one:

prodid       mean        count           sd           cv 424657       12.7124    5541.0000       10.239       80.54999886 158726193    23.7751    1231.0000       17.7567      74.68621596

and have used following code scatterplots of many products @ same time:

ggplot(roll50.last, aes(x=date, y=priceperitem)) + geom_point() + facet_wrap(~prodid)

but want order plots based on these products' cv have summarized in data.frame. wondering if there way can allow me specify want order panel plots order of value in dataframe.

below small sample data. basically, idea different products' price cv = s.d./mean. , want plot these scatterplot of these products in order of cv highest lowest.

#generate reproducible example id = c(1: 3) date = seq(as.date("2011-3-1"), as.date("2011-6-8"), by="days")  id = rep(c(1,2,3,4),each=25) set.seed(01) id = sample(id)  price = rep(c(1:20), each = 5) price = sample(price) data = data.frame(date, id, price)

you can turn prodid factor , set order of factor categories based on size of coefficient of variation. example, let's assume data frame cv values called cv. then, order prodid values of cv:

roll50.last$prodid = factor(roll50.last$prodid,                              levels = cv$prodid[order(cv$cv, decreasing=true)])

now, when plot data, prodid facets ordered decreasing size of cv.


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