[R] which function

[arnaud Gaboury]

Dear group,

Here is a list of elements :


l <-
c("100415", "100416", "100419", "100420", "100421", "100422", 
"100423", "100426", "100427", "100428", "100429", "100430", "100503", 
"100504", "100505", "100506", "100507", "100510", "100511", "100512", 
"100513", "100514", "100517", "100518", "100519", "100520", "100521", 
"100524", "100525", "100526", "100527", "100528", "100531")


> l[3:4]
[1] "100419" "100420"  #result is fine


> l[(which(100420==l))-1:which(100420==l)]
[1] "100419" "100416" "100415"      #can't understand why I do not have same
result than the above line


Thank You for help