Κανονικές αλληλουχίες

# How to produce regular sequences with the : operator
1:5
5:1
-1:-5
-5:-1
-1:5
1:-5

0:10
0:10 / 10
0:20 / 20
0:40 / 20

# The seq function can be used to produce a sequence
seq(1, 5)
seq(5, 1)

# The by option, control the step of the sequence
seq(0, 1, by = 0.1)
seq(-1, 1, by = 0.5)
seq(0, 1, by = -0.1) # no, this not possible
seq(1, 0, by = -0.1)

# The length.out option, control the size of the vector
seq(0, 10, by = 2)
seq(0, 10, length.out = 6)
seq(0, 10, length.out = 7)
seq(0, 10, by = 10/6)
seq(0, 10, by = 5/3)

# Options can be given in any order
seq(from = 0, to = 10, by = 2)  
seq(from = 0, to = 10, length.out = 5) 
seq(to = 1, length.out = 5, from = 0)

# Replication, sequence with the same values
rep(1, 5)
rep(1, times = 5)
rep(c(1, 2), times = 5)
rep(c(1, 2), each = 5)
rep(NA, times = 5)

# not possible, a sequence to Infinity cannot be produced
seq(0, Inf)

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Athanassios Stavrakoudis, Sat 20 Apr 2024