[R] Understand Rcode- subset

[Jhon Grey]

Hi!
I am facing a problem in understanding the R-Code
Suppose I have a dataset named- transact with its values like following:

 
 
 
 
  customer_ID 
  shopping_pt
  record_type
 
 
  10000000
  1
  0
 
 
  10000000
  2
  0
 
 
  10000000
  3
  0
 
 
  10000000
  4
  0
 
 
  10000000
  5
  0
 
 
  10000000
  6
  0
 
 
  10000000
  7
  0
 
 
  10000000
  8
  0
 
 
  10000000
  9
  1
 
 
  10000005
  1
  0
 
 
  10000005
  2
  0
 
 
  10000005
  3
  0
 
 
  10000005
  4
  0
 
 
  10000005
  5
  0
 
 
  10000005
  6
  1
 
 
  10000007
  1
  0
 
 
  10000007
  2
  0
 
 
  10000007
  3
  0
 
 
  10000007
  4
  0
 
How does the following code work and the results of sub and id-
id<-transact$record_type==1sub<-train[c(id[2:length(id)],FALSE),]id<-c(id[3:length(id)],FALSE,FALSE) sub2<-train[id,]
Thanks in advance!
 		 	   		  
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