在 R 控制檯內繪圖

以下程式碼可以從 Weka 課程中找到

鑑於 iris.arff 載入在 weka 中，在 Weka Explorer 的 R console 或 Weka KnowledgeFlow 的 R Scripting 中，你可以使用以下程式碼來製作漂亮的圖：

library(ggplot2)

ggplot(rdata, aes(x = petallength)) + geom_density()

ggplot(rdata, aes(x = petallength)) + geom_density() + xlim(0,8)

ggplot(rdata, aes(x = petallength)) + geom_density(adjust = 0.5) + xlim(0,8)

ggplot(rdata, aes(x = petallength, color = class)) + geom_density(adjust = 0.5) + xlim(0,8)

ggplot(rdata, aes(x = petallength, color = class, fill = class)) + geom_density(adjust = 0.5) + xlim(0,8)

ggplot(rdata, aes(x = petallength, color = class, fill = class)) + geom_density(adjust = 0.5, alpha = 0.5) + xlim(0,8)

library(reshape2)
ndata = melt(rdata)
ndata

ggplot(ndata, aes(x = value, color = class, fill = class)) + geom_density(adjust = 0.5, alpha = 0.5) + xlim(0,8) + facet_grid(variable ~ .)

ggplot(ndata, aes(x = value, color = class, fill = class)) + geom_density(adjust = 0.5, alpha = 0.5) + xlim(0,8) + facet_grid(. ~ variable)

ggplot(ndata, aes(y = value, x = class, colour = class)) + geom_boxplot() + facet_grid(. ~ variable)