These are great, thanks.
I always forget about paste().
===
Richard Sherman
rss.pdx using gmail.com
> On Aug 22, 2018, at 17:56, Fox, John <jfox using mcmaster.ca> wrote:
>
> fm <- vector("character",6)
> fm[1]<- "mpg ~ hp"
> for(i in 2:6)fm[i]<- paste0(fm[i-1]," + I(hp^", i,")")