Determine the magic sum from a magic square
6 次查看(过去 30 天)
显示 更早的评论
Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.
For this problem I wrote:
m = sum(n)
This gave me 15 15 15. Why is this not correct?
I then tried
m = sum(n(1, :))
This gave me 15. Why is this not correct?
I don't understand why my answer is not accepted. This is for Cody Problem 1087: Magic is simple (for beginners).
1 个评论
David Goodmanson
2022-9-22
Hi Farook,
It looks like you are given the size of the magic square, but not the magic square itself. So if all you are given is that the magic square is 3x3, how do you obtain 15 from n=3?
采纳的回答
Davide Masiello
2022-9-22
编辑:Davide Masiello
2022-9-22
I think you are inputting the magic square itself to your function, rather than its order.
I believe the relation between a magic square order (n) and the magic sum (S) is
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1133235/image.png)
So your function should be
function out = magic_sum(n)
out = n*(n^2+1)/2
end
2 个评论
Nathan Hardenberg
2023-7-25
While the formula is a valid solution I think the intended way is to sum up one colum or row, since all rows/colums and diagonals do sum up to the same number:
mag_sqr = magic(3)
sol1 = sum(mag_sqr(:,1)) % sum up first colum
sol2 = sum(mag_sqr(1,:)) % sum up first row
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Operating on Diagonal Matrices 的更多信息
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!