Tks, i have to do it.....
--
PO SU
mail: desolato...@163.com
Majored in Statistics from SJTU
At 2014-10-11 17:57:40, "Jim Lemon" <j...@bitwrit.com.au> wrote:
>On Sat, 11 Oct 2014 05:25:14 PM PO SU wrote:
>> Dear helpeRs,
>> let a <- 1:10
>> let b <- integer(0) first, then i will randomly write a integer
>> differently in the range(1,10) or NULL into b. for supposed 5 times.
>then
>> i want to get a[-b],that means i not want the values at index b. if any
>> time of 5 times generate a integer, it works fine. but when all the 5
>> times generate NULL, it can't work! Because of the a[-integer(0)]
>> =integer(0) .
>> I ask the same question once before, now i encount it again, i think
>> a[-integer(0)] should return a not integer(0) ! Is any one have the
>same
>> idea with me ? or give me a oppisite case that a[-integer(0)] need to
>be
>> integer(0) ?
>>
>Hi PO SU,
>How about:
>
>if(length(b)) a<-a[-b]
>
>Jim
>
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