while() and for() loops in R

gistfile1.r

# PRINT THE INTEGERS 1 THROUGH 10
#
# VERSION 1 -- using while()
# make the initial assignment of variable count_1 to 0 (not necessary)
count_1 <- 0
# the while loop - conditional statement in the first parenthesis, 
# then the repeated steps within the {}
while (count_1 < 10) 
{  count_1 <- count_1 + 1
   print(count_1)
}
#
#
# VERSION 2 -- using for()
#              and a vector instead of 10 iterations of the object
# define a vector "counter" with 10 elements
counter <- numeric(10)
# print the vector, which is populated with zeros
print (counter)
# for the first through tenth elements, assign the element the value of the position in the loop 
for (i in 1:10)
  counter[i] <- i
# print the vector
print (counter)
#
#
# ================================
# If this is an assignment "Print the integers 1 through 10", then a couple of other approaches are possible
#
# VERSION 3a -- R has a sequence function!
# simply entering "1:10" will print the list of the integers from 1 to 10
1:10
#
# VERSION 3b - a more elaborate and flexible approach
seq(from=1, to=10, by=1)
# variant: counting backwards from zero to -20 by 2
seq(from=0, to=-20, by=-2)