使用ggplot2中的scale_x_date格式化日期 [英] Formatting dates with scale_x_date in ggplot2

问题描述

在以前的ggplot2版本中，我可以使用以下两个命令之一来格式化我的x日期：

  scale_x_date（breaks =1个月，minor_breaks =1周，labels =（date_format =％B））+ 
  

或

  scale_x_date（major =months，minor =weeks ，format =％B）+ 
  

生成％B格式，全月

（恐怕我不能再区分哪一个工作，因为他们都被注释掉了。）

$ b $我不记得什么时候，但是在ubuntu 12.04升级中更新了R或ggplot之后，这不再适用于我。现在，相同的数据产生错误：

  scale_labels.continuous（scale）中的错误：
中断和标签不同的长度
  

第一个和

  continuous_scale中的错误（美观，日期，身份，休息=休息，
未使用参数（major =months，minor =weeks格式=％B）
  

第二个。

如果我删除labels =参数，并应用

  scale_x_date（breaks =1个月，minor_breaks = 1周）+ 
  

它生成日期格式为YYYY-MM-DD

咨询帮助功能？scale_x_date，我还尝试过以下操作：

  scale_x_date（breaks =1个月，minor_breaks =1周，labels = date_format（％B））+ 
  / pre> 
 
 
但是这会产生这个错误：
 结构错误（list（call = match.call（），aesthetics = aesthetics，
找不到函数date_format
  / pre> 
 
 
如何在我的x轴上实现月名％B格式？ （如果您对产生这些错误消息的机制有其他见解，我也会感谢。）
解决方案
新的ggplot2 v 2.0.0，一种方法是：
  scale_x_date（date_breaks =1个月，date_minor_breaks = 1周，date_labels =％B）
  
 
In a previous version of ggplot2, I was able to use one of the two following commands to format my x dates:
Either
scale_x_date(breaks = "1 month", minor_breaks = "1 week", labels=(date_format="%B")) +
or
scale_x_date(major="months", minor="weeks", format="%B") +
to produce "%B" format, of full month name.

(I'm afraid I can no longer distinguish which one worked, because they were both commented out.)

I don't recall when, but after updating either R or ggplot in an ubuntu 12.04 upgrade, this no longer worked for me.  Now, the very same data produces the error:
Error in scale_labels.continuous(scale) : 
  Breaks and labels are different lengths
With the first, and
Error in continuous_scale(aesthetics, "date", identity, breaks = breaks,  : 
  unused argument(s) (major = "months", minor = "weeks", format = "%B")
With the second.

If I remove the labels= argument, and apply
scale_x_date(breaks = "1 month", minor_breaks = "1 week") +
it produces a date format of "YYYY-MM-DD" on the first of each month.

Consulting with the help for function ?scale_x_date, I've also tried the following:
scale_x_date(breaks = "1 month", minor_breaks = "1 week", labels=date_format("%B")) +
But this produces this error:
Error in structure(list(call = match.call(), aesthetics = aesthetics,  : 
  could not find function "date_format"
How can I achieve month-name "%B" formatting on my x axis?  (If you have any additional insights into the mechanics producing these error messages, I'd also appreciate it.)
解决方案
With the new ggplot2 v 2.0.0, a way to do it is :
scale_x_date(date_breaks = "1 month", date_minor_breaks = "1 week", date_labels = "%B")


                        
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