[R] compatibility S-plus R: stepwise fonction

[Solenne Carat]

Hi,
I tried to use S-plus script with R. I thought it was easy because there 
aren't a lot differences between S-plus and R syntaxe. However, I didn't 
succeed to use stepwise function in R. I think the best equivalent in R 
is step, but this function seems not to use same parameters.
is there a better equivalent in R ? or package to make stepwise 
compatible with R ?

Thank you for answers
Regards,

solenne carat
student
Institut du thorax - Inserm U533
France