for loop in r code example

Example 1: r loops

# Basic syntax of for loop:
for (i in sequence) {
  code to be repeated
}

# Example usage of for loop:
for (i in 1:5) {
  print(i)
}


# Basic syntax of while loop:
while (condition_is_true) {
  code to be repeated
}

# Example usage of while loop:
i = 1
while (i < 5) {	# True while i is less than 5
  print(i)
  i = i + 1		# Increment i each iteration
}

Example 2: loop through list in r

primes_list <- list(2, 3, 5, 7, 11, 13)

# loop version 1
for (p in primes_list) {
  print(p)
}

# loop version 2
for (i in 1:length(primes_list)) {
  print(primes_list[[i]])
}

Example 3: r for loop

# Basic syntax:
for (i in sequence) {
  code to be repeated
}

# Example usage:
for (i in 1:5) {
  print(i)
}
# Returns:
[1] 1
[1] 2
[1] 3
[1] 4
[1] 5

# Note, you can completely exit from a loop with "break", or skip to the
#	next iteration of a loop with "next"

# Example of next and break:
for (i in 1:5) {
  if (i == 2) { # Skip to next iteration if i = 2
    next
    }
  if (i == 4) { # Exit loop entirely if i = 4
    break
    }
  print(i)
}
# Returns:
[1] 1
[1] 3

Example 4: r for loop

for (val in sequence)
{
statement
}

Example 5: for in r

for (val in x) {
if(val %% 2 == 0)  count = count+1
}