缁熻杞欢瀹為獙
1
姣忛闇�娉ㄦ剰
1
鍛戒护浠ｇ爜
2
缁撴灉鎴栧浘褰?/p>
3
鑷繁鐨勯敊璇?/p>
1 y =
23
log
)
10
sin(
4
)
4
3
.
0
(
2
飥?/p>
飪?/p>
飥?/p>
飥?/p>
e
飦?/p>
y <- sin(10*pi)*exp(-0.3+4^2)+log(23)/log(4)
2
x = sin(223/3)
锛?/p>
y = x^2
锛?/p>
z = y*10
锛涙眰
x+2y-5z
x <- sin(223/3);y <- x^2;x+2*y-5*z
3
寤虹珛璧峰鍊?/p>
=3,
澧為噺鍊?/p>
=5.5,
缁堟鍊?/p>
=44
鐨勪竴缁存暟缁?/p>
x
x <- seq(3.47,by=5.5)
4
寤虹珛绛夊樊涓�缁存暟缁?/p>
x
锛氶椤逛负
0,
鏈」涓?/p>
飦?/p>
,
椤规暟涓?/p>
15
x <- seq(0,pi,length=15)
5
灏?/p>
100,200,200,200,400,600,600,600,800
杈撳叆
R
涓紝淇濆瓨鍒?/p>
numeric
鍙橀噺涓?/p>
numeric <- c(100,200,200,200,400,600,600,600,800)
6
灏?/p>
numeric
杞崲涓?/p>
factor
瀛樺叆鍙橀噺
factor.numeric
锛屽苟鐢?/p>
class
锛堬級纭銆?/p>
factor.numeric <- as.factor(numeric)
7
鏌ョ湅
factor.numeric
鐨勫唴瀹?/p>
factor.numeric
8
鍒涘缓涓�涓?/p>
2
鍒?/p>
50
鐨勫悜閲?/p>
,
褰㈠紡涓?/p>
2, 4, 6, 8, ..., 48, 50
骞跺悕涓轰负
vector1
vector1 <- seq(from=2,to=50,by=2)
9
閫夊彇
vector1
涓殑绗?/p>
20
涓厓绱?/p>
vector1[20]
10
閫夊彇
vector1
涓殑绗?/p>
10
锛?/p>
15
锛?/p>
20
涓厓绱?/p>
vector1[c(10,15,20)]
11
閫夊彇
vector1
涓殑绗?/p>
10
鍒?/p>
20
涓厓绱?/p>
vector[10:20]
12
閫夊彇
vector1
涓�煎ぇ浜?/p>
40
鐨勫厓绱?/p>
vector1[vector1>40]
13
鍒涘缓鍚戦噺
1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5
rep(1:5,5)
14
浣跨敤
rep()
鍒涘缓鍚戦噺
0 0 0 0 0 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4
4
rep(0:4,rep(5,5))
15
鐢ㄥ嚱鏁?/p>
rep()
鏋勯�犱竴涓悜閲?/p>
x,
瀹冪敱
3
涓?/p>
3,4
涓?/p>
2,5
涓?/p>
1
鏋勬垚
x=c(rep(3,3),rep(2,4),rep(1,5))
缁熻杞欢瀹為獙
2
姣忛闇�娉ㄦ剰
1
鍛戒护浠ｇ爜
2
缁撴灉鎴栧浘褰?/p>
3
鑷繁鐨勯敊璇?/p>