在scale_x_datetime中抑制警告

Question

这不是重复,因为该推定重复中的所有方法都不适用于此处.他们都没有导致警告消失.

事实上,我从下面的Konrad得到了答案 - 使用suppressMessages.在断言作为可能重复的链接中,他们建议suppressWarnings,这不起作用.

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最后确定如何让R在ggplot日期轴上正确使用我的时区(scale_x_datetime在这里的帖子中找到,在它使用我的本地时区之前,即使数据已经设置了时区),但它现在抱怨警告:

Scale for 'x' is already present. Adding another scale for 'x', which will replace the existing scale. 

这很烦人,因为我必须做很多事情,并且不想养成忽略所有警告的习惯.我该怎么办呢？我显然已经尝试过suppressWarnings(有和没有打印)和options(warn=-1).

• R版本是3.1.3
• ggplot2_1.0.1

• scales_0.2.4

  library(lubridate,quietly=T,warn.conflicts=T)
  library(ggplot2,quietly=T,warn.conflicts=T)
  library(scales,quietly=T,warn.conflicts=T)
  
  
  sclip.time <-  ymd_hms("2014-06-16 00:00:00",tz="US/Pacific")
  eclip.time <-  ymd_hms("2014-06-17 23:59:59",tz="US/Pacific")
  
  sdata.time <-  ymd_hms("2014-06-16 00:00:00",tz="US/Pacific")
  edata.time <-  ymd_hms("2014-06-17 23:59:59",tz="US/Pacific")
  
  
  xdata <- seq(sdata.time,edata.time,length.out=100)  
  xfrac <- seq(0,4*3.1416,length.out=100)
  ydata <- pmax(0.25,sin(xfrac))
  ydata <- sin(xfrac)
  ddf <- data.frame(x=xdata,y=ydata)
  
  date_format_tz <- function(format = "%Y-%m-%d", tz = "UTC") {
    function(x) format(x, format, tz=tz)
  }
  
  options(warn=-1)
  
  suppressWarnings(
  ggplot(ddf) + 
    geom_line(aes(x,y),col="blue") +
    geom_vline(xintercept=as.numeric(sclip.time),color="darkred") +
    geom_vline(xintercept=as.numeric(eclip.time),color="darkgreen") +
    xlim(sclip.time,edata.time) +
    scale_x_datetime(  breaks = date_breaks("1 day"),
                       labels = date_format_tz("%Y-%m-%d %H:%M", tz="US/Pacific"))
  )
  

  

Answer 1

您必须使用以下代码段中的suppressMessages和的组合print:

suppressMessages(print(
  ggplot(ddf) + 
    geom_line(aes(x,y),col="blue") +
    geom_vline(xintercept=as.numeric(sclip.time),color="darkred") +
    geom_vline(xintercept=as.numeric(eclip.time),color="darkgreen") +
    xlim(sclip.time,edata.time) +
    scale_x_datetime(  breaks = date_breaks("1 day"),
                       labels = date_format_tz("%Y-%m-%d %H:%M", tz="US/Pacific"))
))