Nothing
# Loops A, B, C, and D generate very similar results.
# A. for loop
x1 <- 2; x2 <- NULL
for (i in 5:7) {
x2 <- c(x2, x1 * i)
}
x2; i
# B. while loop with "cond" being evaluated
y1 <- 2; y2 <- NULL; j <- 5
while (j < 8) {
y2 <- c(y2, y1 * j)
j <- j + 1
}
y2; j
# C. while loop with break
z1 <- 2; z2 <- NULL; k <- 5
while (TRUE) {
z2 <- c(z2, z1 * k)
k <- k + 1
if (k >= 8) break
}
z2; k
# D. repeat loop with break
p1 <- 2; p2 <- NULL; n <- 5
repeat {
p2 <- c(p2, p1 * n)
n <- n + 1
if (n >= 8) break
}
p2; n
# E. repeat loop with an unknown number of loops
input <- 0.1; tolerance <- 0.0001
iteration <- 0; max.iteration <- 100
repeat {
output <- input * input
input <- input - output
iteration <- iteration + 1
if (abs(output) < tolerance || iteration > max.iteration) break
}
input; output; iteration
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