r - 使用 R 和 ggplot2 时连续缩放的错误

Question

我正在遵循书中的一个例子Machine Learning for Hackers . R 2.15.1和 ggplot 0.91使用。我收到以下错误:

Error in continuous_scale(aesthetics, "date", identity, breaks = breaks,  : 
unused argument(s) (major = "5 years", format = "%Y")
In addition: Warning message:
In discrete_scale(aesthetic, "manual", pal, ...) :
"legend" argument in scale_XXX is deprecated. Use guide="none" for suppress the guide   display.

我尝试运行的代码是

state.plot<-ggplot(all.sightings, aes(x=YearMonth,y=Sightings))+ 
    geom_line(aes(color="darkblue"))+ 
    facet_wrap(~State,nrow=10,ncol=5)+
    theme_bw()+ 
    scale_color_manual(values=c("darkblue"="darkblue"),legend=FALSE)+   
    scale_x_date(major="5 years", format="%Y")+ 
    xlab("Time")+ylab("Number of Sightings")+
    opts(title="Number of UFO sightings by Month-Year and U.S. State (1990-2010)")

我用过 library(scales)但这没有用。有什么想法吗？

Answer 1

试试这个

state.plot<-ggplot(all.sightings, aes(x=YearMonth,y=Sightings))+ 
    geom_line(aes(color="darkblue"))+ 
    facet_wrap(~State,nrow=10,ncol=5)+
    theme_bw()+ 
    scale_color_manual(values=c("darkblue"="darkblue"),guide=FALSE)+   
    scale_x_date(breaks = date_breaks("5 years"), labels = date_format("%Y"))+ 
    xlab("Time")+ylab("Number of Sightings")+
    opts(title="Number of UFO sightings by Month-Year and U.S. State (1990-2010)")