ggplot rank stack bar automatically.

df <- structure(c(106487, 495681, 1597442,

2452577, 2065141, 2271925, 4735484, 3555352,
     8056040, 4321887, 2463194, 347566, 621147,
     1325727, 1123492, 800368, 761550, 1359737,
     1073726, 36, 53, 141, 41538, 64759, 124160,
     69942, 74862, 323543, 247236, 112059, 16595,
     37028, 153249, 427642, 1588178, 2738157,
     2795672, 2265696, 11951, 33424, 62469,
     74720, 166607, 404044, 426967, 38972, 361888,
     1143671, 1516716, 160037, 354804, 996944,
     1716374, 1982735, 3615225, 4486806, 3037122,
     17, 54, 55, 210, 312, 358, 857, 350, 7368,
     8443, 6286, 1750, 7367, 14092, 28954, 80779,
     176893, 354939, 446792, 33333, 69911, 53144,
     29169, 18005, 11704, 13363, 18028, 46547,
     14574, 8954, 2483, 14693, 25467, 25215,
     41254, 46237, 98263, 185986), .Dim = c(19,
     5), .Dimnames = list(c("1820-30", "1831-40",
     "1841-50", "1851-60", "1861-70", "1871-80",
     "1881-90", "1891-00", "1901-10", "1911-20",
     "1921-30", "1931-40", "1941-50", "1951-60",
     "1961-70", "1971-80", "1981-90", "1991-00",
     "2001-06"), c("Europe", "Asia", "Americas",
     "Africa", "Oceania")))

df.m <- melt(df)
df.m <- rename(df.m, c(X1 = "Period", X2 = "Region")) 

df.m <- transform(df.m, Period = reorder(Period, -1*value)) 

ggplot(df.m, aes(x = Period, y = value/1e+06, fill = Region))  + 

geom_bar(stat = "identity", position = "stack") 

=====================================================

levels(df.m$Period)

[1] "1820-30" "1831-40" "1841-50" "1851-60" "1861-70" "1871-80" "1881-90"
 [8] "1891-00" "1901-10" "1911-20" "1921-30" "1931-40" "1941-50" "1951-60"
[15] "1961-70" "1971-80" "1981-90" "1991-00" "2001-06"
=====================================================
I think after reordering, the levels changed, but the fact was nothing has
got change >_<!!!

I found I have many commands happen like this. especially drawing
graph...ordering doesn't work...
[[elided Yahoo spam]]
it is crazy, "R" teases me.





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