scale_datetime

scale_x_datetime(name=NULL, limits=NULL, major=NULL, minor=NULL, format=NULL, tz="", ...)
scale_y_datetime(name=NULL, limits=NULL, major=NULL, minor=NULL, format=NULL, tz="", ...)

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Parameters

Parameters control the appearance of the scale. In addition to the parameters listed below (if any), any aesthetic can be used as a parameter, in which case it will override any aesthetic mapping.

• name: name of scale to appear in legend or on axis. Maybe be an expression: see ?plotmath
• limits: numeric vector of length 2, giving the extent of the scale
• major: NULL
• minor: NULL
• format: NULL
• tz: NULL

Returns

This function returns a scale object.

See also

• scale_discrete: Discrete position scales

Examples

> start <- ISOdate(2001, 1, 1, tz = "") 
> df <- data.frame( 
+   day30  = start + round(runif(100, max = 30 * 86400)), 
+   day7  = start + round(runif(100, max = 7 * 86400)), 
+   day   = start + round(runif(100, max = 86400)), 
+   hour10 = start + round(runif(100, max = 10 * 3600)), 
+   hour5 = start + round(runif(100, max = 5 * 3600)), 
+   hour  = start + round(runif(100, max = 3600)), 
+   min10 = start + round(runif(100, max = 10 * 60)), 
+   min5  = start + round(runif(100, max = 5 * 60)), 
+   min   = start + round(runif(100, max = 60)), 
+   sec10 = start + round(runif(100, max = 10)), 
+   y = runif(100) 
+ ) 
>  
> # Automatic scale selection 
> qplot(sec10, y, data = df) 
  
> qplot(min, y, data = df) 
  
> qplot(min5, y, data = df) 
  
> qplot(min10, y, data = df) 
  
> qplot(hour, y, data = df) 
  
> qplot(hour5, y, data = df) 
  
> qplot(hour10, y, data = df) 
  
> qplot(day, y, data = df) 
  
> qplot(day30, y, data = df) 
  
>  
> # Manual scale selection 
> qplot(day30, y, data = df) 
  
> last_plot() + scale_x_datetime(major = "2 weeks") 
  
> last_plot() + scale_x_datetime(major = "2 weeks", minor = "1 week") 
  
> last_plot() + scale_x_datetime(major = "10 days") 
  
> # See ?strptime for formatting parameters 
> last_plot() + scale_x_datetime(major = "10 days", format = "%d/%m") 
  

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© Hadley Wickham 2010