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+ 2

# Sum in R - Use a loop to calculate the sum of all numbers

Sum Use a loop to calculate the sum of all numbers that are a multiple of 3 in the range of 1 to 1000. A number is a multiple of 3 if the remainder of dividing it by 3 is 0. sum = 0 while (sum < 1000) { if (sum %% 3 == 0) print (sum(sum)) sum = sum +1 } I have created the loop but I cannot figure out how to sum the values. Can you help?

7 Answers

+ 5

You need an extra variabele to add every sum that passes your if statement. And only print that variable after the loop finishes.

+ 5

print(total)

+ 4

#try this
sum <- 0
total <- 0
while (sum <= 1000) {
if (sum %% 3 == 0)
total <- total + sum
sum <- sum +1
}
print(total)

+ 3

Try it in this way:
1st check if 3%%X == 0, then add it to some value Y. Loop 1000 times.
sum <- 0
for (x in 1:1000) {
if (x%%3 == 0) {
sum <- sum+x
}
print(sum)

+ 2

Thank you all!
sum <- 0
total <- 0
while (sum <= 1000) {
if (sum %% 3 == 0)
total <- total + sum
sum <- sum +1
}
print(sum)
this is still not solving the problem becouse it sums the number of lines of code not their value!

+ 1

Hi thank you all for the help. However it is not working and I do not have any clue of how to solve the problem ... any other idea?

+ 1

sum <- 0
for (x in 1:1000) {
if (x %% 3 == 0) {
sum = sum + x
}
}
print(sum)