[R] nvmax in REGSUBSETS function

[CZ]

Hello,

I am using regsubsets function package 'leaps' and want to let it regress on
every 2 variables.

I wanted to leaps but wasn't able to control the size of variables. So I
decided to use regsubsets.

But I notice that if I set nvmax=2, it will regress on 3 variables instead
of 2; and when my nvmax=1, it regresses on 2, which is weird to me.  

I wonder whether my setting was incorrect or my understanding on nvmax was
wrong.
Thank you. 

CZ
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