[R] seq(2,5,-2) not an error but NULL

Robin Hankin r.hankin at noc.soton.ac.uk
Mon Mar 27 16:10:16 CEST 2006

Hi Duncan et al

> I don't think seq() could reasonably be expected to handle "to" and  
> "by" arguments with complex values.  Trying to divide the (to-from)  
> difference by (by) to find how many steps to take would usually  
> result in enough rounding error that the result wouldn't be real- 
> valued.  It's enough of a miracle that it correctly handles
> seq(from=1, by=1+1i, len=4)
> Duncan Murdoch

well it depends on your definition of miracles, but I wouldn't say

1 + (0:3) * (1+1i)

is particularly miraculous ;-\

best wishes


Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743

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