Question

IN R

a <- (seq(4,100, by =4))

b<- (seq(.8,40, by = .8))

1. Combine a and b as columns to create a new matrix.

2. combine a and b as rows to create a new matrix.

Answer 1

a)

cbind(a,b)

Output

       a    b
 [1,]   4  0.8
 [2,]   8  1.6
 [3,]  12  2.4
 [4,]  16  3.2
 [5,]  20  4.0
 [6,]  24  4.8
 [7,]  28  5.6
 [8,]  32  6.4
 [9,]  36  7.2
[10,]  40  8.0
[11,]  44  8.8
[12,]  48  9.6
[13,]  52 10.4
[14,]  56 11.2
[15,]  60 12.0
[16,]  64 12.8
[17,]  68 13.6
[18,]  72 14.4
[19,]  76 15.2
[20,]  80 16.0
[21,]  84 16.8
[22,]  88 17.6
[23,]  92 18.4
[24,]  96 19.2
[25,] 100 20.0
[26,]   4 20.8
[27,]   8 21.6
[28,]  12 22.4
[29,]  16 23.2
[30,]  20 24.0
[31,]  24 24.8
[32,]  28 25.6
[33,]  32 26.4
[34,]  36 27.2
[35,]  40 28.0
[36,]  44 28.8
[37,]  48 29.6
[38,]  52 30.4
[39,]  56 31.2
[40,]  60 32.0
[41,]  64 32.8
[42,]  68 33.6
[43,]  72 34.4
[44,]  76 35.2
[45,]  80 36.0
[46,]  84 36.8
[47,]  88 37.6
[48,]  92 38.4
[49,]  96 39.2
[50,] 100 40.0

b)

rbind(a,b)