1、
for (i in 1:10) { print("hello,world!") }
2、
for (i in 1:10) { print(i) }
3、
sum = 0
for (i in seq(1,100,1)) { sum = sum + i } print(sum)
4、求二维数组中的最大值
x<-c(11,34,12,87,89,93,54,31,88) ar<-array(x,c(3,3)) max<-ar[1,1] for(i in 1:3) { for(j in 1:3) { if (ar[i,j] > max) { max = ar[i,j] } } } print(max)
求三维数组的最大值
dim1 <- c("a1","a2","a3") dim2 <- c("b1","b2","b3","b4","b3") dim3 <- c("c1","c2") tmp <- sample(1:100,3*5*2) a <- array(tmp,c(3,5,2),dimnames = list(dim1,dim2,dim3)) max = a[1,1,1] for (k in 1:2) { for (j in 1:5) { for (i in 1:3) { if (a[i,j,k] > max) { max = a[i,j,k] } } } } print(max) max(tmp)
5、求Fibonacci序列
n <- 30 a <- c(0,1) for (i in 3:n) { a[i] = a[i - 1] + a[i - 2] } print(a)
6、已知Fibonacc数列为：1,1,2,3,5,8，求Fibonacc数列前50项的和
n <- 50 a <- c(1,1) sum <- a[1] + a[2] for (i in 3:n) { a[i] = a[i - 1] + a[i - 2] sum = sum + a[i] } print(sum)
7、处理矩阵、数据框元素
a <- matrix(1:16,4,4) a for (i in 1:nrow(a)) { for (j in 1:ncol(a)) { a[i,j] = a[i,j] * 2 } } a
