Week 5 Feb 1.pdf - Week 5 Feb 1 Wednesday 11:30 AM What...

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> rep(c(8,1,2), length=10) #repeats vector until 10 elements [1] 8 1 2 8 1 2 8 1 2 8 What we've learned so far: > rep(c(8,1,2), each=3) [1] 8 8 8 1 1 1 2 2 2 We can now do this more "neatly" using each > 1:20 [1] 1 2 3 4 ……… 20 > 20:1 [1] 20 19 18 …… 1 We know: >seq(1,2, by=0.1) [1] 1.0 1.1 1.2 …….. 1.9 2.0 >seq(1.1, by=0.01, length=13) repeat +0.01 13 times [1] 1.1 1.11 1.12 …… 1.22 Sequence vectors allow you to choose how much the numbers differ by (not just 1) Sequence Vectors >c(5) [1] 5 >c(1:5) >[1] 1 2 3 4 5 >rep(c(5), 3) [1] 5 5 5 NOT HERE: You should only use c when you want to combine single values or vectors into a bigger vector Arranging a vector into a 2D array >matrix(3, nrow=2, ncol=2) [,1][,2] [1,] 3 3 [2,] 3 3 >matrix (1:6, nrow=2, ncol=3, byrow=TRUE) [,1] [,2] [,3] [1,] 1 2 3 [2,] 4 5 6 Matrix function that takes a vector as data You can assign matrices to variables Variables containing matrices can be multiplied as MATRICES (%*%) or ELEMENT-by-element (*) Matrices do not have to be treated as linear algebra - they can just be a way to display your data
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