r - Sorting ggplot legends by factor (here: months) -

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If you consider this code: 

  library (ggplot2) df & lt ; - As ("X", "Y") df $ date & lt; - as.factor (c ("April", "Gop (DF, AES (x = x, y = y, color = date)) + GOM_point (size = 3, size = 20)   
 How can I sort my legend by a temporary sequence of months?   
 
 
  < df $ dates & lt; -  with line:  
  m <- c ("april", "may", "june", "august") df $ date & lt; - Factor (M, Level = M)

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