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Compute the sum of perimeter of matrix

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David
David 2020-3-4
回答： Jemima Pulipati 2020-3-9
My TA ask me to make a function code for this specific homework : computes the sum of the elements of an input matrix A that are on the “perimeter” of A.
This is what I have tried so far
function : sum=(A)
M= 2*(sum(A(1,1:end)) + sum(A(1:end,1)) + sum(A(end,1:end)) + sum(A(1:end,end))
end
please help me explain whether i am wrong or right
  1 个评论
James Tursa
James Tursa 2020-3-4
What is the 2 for? Did you try some examples to see if your code produces what you expect? Does your code count the corner elements twice?

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回答（1 个）

Jemima Pulipati
Jemima Pulipati 2020-3-9
Similar question has already been answered by the community which could be relevant to you. Please refer to the following link.
https://www.mathworks.com/matlabcentral/answers/298528-how-can-i-find-the-sum-of-the-perimeter-of-a-matrix
There is also a function in MathWorks File Exchange which could help you but the matrix should have each dimension atleast 2
https://www.mathworks.com/matlabcentral/fileexchange/71595-sum-of-values-on-the-perimeter-of-a-matrix

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