2.5.2 For Loop
For loop repeats a block of code a specified number of times. The syntax is
# Syntax of for loop
for (i in SEQUENCE) {
# Code block to be executed
}In loop syntax, the code block will be executed with respect to each elements in SEQUENCE. For example, we want to print all numbers within 50 that are divisible by 3.
# Example 4
for(i in 1:50){
if (i %% 3 == 0){ # %% is modulo operator, i.e. returns the remiainder of i/3
print(i)
}
}Remark: The form of SEQUENCE can vary in many ways and doesn’t even need to be a numeric array. See the examples below.
# Example 5: print all the even number within 50
for(i in seq(2, 50, by = 2)){
print(i)
}# Example 6: say hello to famous mathematicians
name_list = c("Gauss", "Euler", "Fourier", "Cantor")
for(i in name_list){
print(paste0("Hello, ", i, "!"))
}