automatic lines setting?

Here the first few lines of my .gvimrc:

$ head .gvimrc
set lines=500 " over zelous numbers of lines
let &lines = ((float2nr(0.85*&lines)>52)?float2nr(0.85*&lines):52)

set columns=85
" double the size of window if running diff
if &diff
let &columns = ((&columns * 2 > 160)? 160: &columns*2)
endif

I wanted gvim to use 85% of the height of the screen or 52 lines,
whichever is greater. If I issue the first two commands by hand after
gvim has open. It will do what I want it to do. Why don't it work as
part of .gvimrc?

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