ggplot2报错

1. Error: could not find function “opts”

   > library(ggplot2)
   > facebookData <- read.delim("FacebookNarcissism.dat",  header = TRUE)
   > 
   > graph <- ggplot(facebookData, aes(NPQC_R_Total, Rating))
   > graph + geom_point() + opts(title = "geom_point()")
   Error: could not find function "opts"

   解决办法：

   opts() has been deprecated a long time ago. Use theme() options. For setting a title, use ggtitle()

   参考：
   https://groups.google.com/forum/#!topic/ggplot2/CaWDdYyBjXw

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