[R] strange behaviour of "POSIXlt" "POSIXt" object

[ikuzar]

Hi, 
I'd like to know what "L" means in "1L" in the instruction below:
for(i in 1:20){ z$mday <- z$mday + 1L ; cat(is.na(z), ": ");print(z)} 

The result :
FALSE : [1] "2009-02-26 06:30:00"
FALSE : [1] "2009-02-27 06:30:00"
FALSE : [1] "2009-02-28 06:30:00"
FALSE : [1] "2009-03-01 06:30:00"
FALSE : [1] "2009-03-02 06:30:00"
FALSE : [1] "2009-03-03 06:30:00"
FALSE : [1] "2009-03-04 06:30:00"
FALSE : [1] "2009-03-05 06:30:00"
FALSE : [1] "2009-03-06 06:30:00"
FALSE : [1] "2009-03-07 06:30:00"
FALSE : [1] "2009-03-08 06:30:00"
FALSE : [1] "2009-03-09 06:30:00"
FALSE : [1] "2009-03-10 06:30:00"
FALSE : [1] "2009-03-11 06:30:00"
FALSE : [1] "2009-03-12 06:30:00"
FALSE : [1] "2009-03-13 06:30:00"
FALSE : [1] "2009-03-14 06:30:00"
FALSE : [1] "2009-03-15 06:30:00"
FALSE : [1] "2009-03-16 06:30:00"
FALSE : [1] "2009-03-17 06:30:00"

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