***～会飞的蝎子～学习宁静致远

I am UsingR just At the very beginning:
BECAREFUL, R IS VERY CASE SENSITIVE...
1. R works more efficient and beautiful on MAC.
2. It's great if you have used : data.entry() and edit().
3. R: browseEnv() use web browser to show the results.
    Also: you can use ls() and objects() to show it~~
4. () is for the entry and [] is for the index.
5. a[a>3] and which(a>3) is very interesting.
6. Use NA for the missing data
7. use mean(a,na.rm=TRUE)

By SCO works on iMac
Wed Jan 09, 08~~~