Hi Arnaud
Try this

l[((which(100420==l))-1):which(100420==l)]

Regards
Mo


arnaud Gaboury <arnaud.gabo...@gmail.com> a écrit :

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

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