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Find the summation of the outer elements of a rectangular matrix

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Vinny
Vinny 2016-4-9
回答： Azzi Abdelmalek 2016-4-9
Using this matrix
a=[2 -3 1 0;5 7 1 -4;9 -6 0 2]
I need to find the sum of all the outer numbers in this matrix using loops and/or conditional statements. I have absolutely no idea on how to go about starting/doing this. Any help is appreciated, thank you.

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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2016-4-9
a=[2 -3 1 0;5 7 1 -4;9 -6 0 2]
t = true(size(a))
t(2:end-1,2:end-1) = false
out = sum(a(t))
Azzi Abdelmalek
Azzi Abdelmalek 2016-4-9
out=sum([a(1:end-1,1)' a(end,1:end-1) a(2:end,end)' a(1,2:end)])

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