Skip to content
Prev 21347 / 29559 Next

Local_coord

Roger Bivand
On Sun, 20 Jul 2014, Lo?c Dutrieux wrote:

            

      
      
      
    

        
This may work, but is no help at all in understanding R - dplyr is very 
new, and the %.% or %>% syntax is even newer, and very confusing if the 
assumptions made in chaining the steps together are wrong. If you do 
things step-by-step, you can debug them:

coord <- read.table('Coord_ha_R.txt', header = TRUE, fill = TRUE)
str(coord)
% str() describes structure, so showing factors as such;
% head() doesn't do this - see dplyr documentation
ref_sub_parc_coord <- read.table("ref_sub_parc_coord.txt",
  header = TRUE)
str(ref_sub_parc_coord)
# create index
# ref_sub_parc_coord$Sub_parc <- seq(1,10)
# how does mutate() do this properly?
ref_sub_parc_coord$Sub_parc <- 1:nrow(ref_sub_parc_coord)
# merge two data frames
mm <- merge(ref_sub_parc_coord, coord, by = "Sub_parc")
str(mm)
mm$X_global = mm$X_local + mm$X
mm$Y_global = mm$Y_local + mm$Y
str(mm)

By the way, using dplyr:

all.equal(plots, mm)

Please always try to use standard R functions if possible; things like 
dlpyr may be helpful sometimes, but for working scientists simplicity and 
the ability to debug each step are really much more practical.

Roger

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

        

  
    

      
      
    

  


  


  


  
  

    

  

    
      
    
    
Thread (4 messages)

  

  

    
            
        Kátia Emidio
        
        Local_coord
      
      Jul 20
    
    
      
            
        Loïc Dutrieux
        
        Local_coord
      
      Jul 20
    
    
      
            
        Oscar Perpiñan
        
        Local_coord
      
      Jul 21
    
    
      
            
        Roger Bivand
        
        Local_coord
      
      Jul 21