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how to sum each element in matrix

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mts
mts 2018-8-20
回答： Image Analyst 2018-8-21
so I have this matrix and i want to sum of the each element of matrix like in this picture.how can i do that.
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Image Analyst
Image Analyst 2018-8-20
No, I can't see. What arrows? What numbers are the sum of what other two numbers? And where is the square?
mts
mts 2018-8-21
I mean red line , yellow line and black line are sum of two numbers also black rectangle is sum of three numbers and red rectangle is sum of four numbers

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Image Analyst
Image Analyst 2018-8-21
You say "I mean red line , yellow line and black line are sum of two numbers also black rectangle is sum of three numbers and red rectangle is sum of four numbers" so
redLineSumOf2 = A(1,1) + A(1,4)
yellowLineSumOf2 = A(1,1) + A(1,3)
blackLineSumOf2 = A(1,1) + A(1,2)
blackRectSumOf3 = sum(A(1, 1:3))
redRectSumOf4 = sum(A(1, 1:4))

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