Hi; What is wrong in my code

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SULE SAHIN 2017-10-30

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评论： Walter Roberson 2018-4-27

If we list all the natural numbers up to 15 that are multiples of 3 or 5, we get 3, 5, 6, 9, 10, 12 and 15. The sum of these multiples is 60. Write a function called sum3and5muls that returns the sum of all the unique multiples of 3 or 5 up to n where n is a positive integer and the only input argument of the function. (Credit: Project Euler)

My answer is;

function sumof = sum3and5muls(n)
 sumof = sum([3:3:n])+sum([5:5:n])-sum([15:15:n]);

Fault; Problem 8 (sum3and5muls): Testing with argument(s) 1 Feedback: Your program made an error for argument(s) 1

Your solution is _not_ correct.

What is wrong in my code?

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Stephen23 2017-10-30

@SULE SAHIN: you do not need to use square brackets, because you are not concatenating anything. Instead of this sum([3:3:n]) you simply need this sum(3:3:n).

Walter Roberson 2018-4-27

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Answer 1

Jan 2017-10-30

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编辑：Jan 2017-10-30

在 MATLAB Online 中打开

The error message tells you, that the output for n=1 differs from the expectations. Look what your code does in this case. What is 3:3:n then? What is its sum?

What happens for n=3?