[BioC] how to replace NA by 1

[Sean Davis]

On Thu, Jan 19, 2012 at 10:31 PM, wang peter <wng.peter at gmail.com> wrote:
> i have a vector
>> start
> [1]  4  5  6 NA
> i want to replace NA by 1
>
> but that didnot work
> gsub(NA, 1, as.character(start), ignore.case = T)

start[is.na(start)]=1