[R] complain about a[-integer(0)]

[PO SU]

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) ?
 




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PO SU
mail: desolator88 at 163.com 
Majored in Statistics from SJTU