Compute average size of 2 regions in a matrix

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Johanna Popp 2021-12-22

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https://ww2.mathworks.cn/matlabcentral/answers/1616125-compute-average-size-of-2-regions-in-a-matrix

评论： Image Analyst 2022-1-2

Hi all,

I would like to normalze a structural connectivity matrix (360 x 360) containing the number of streamlines between any two regions by the (average/sum) size of the respective two regions.

I do have information about the size of each brain regions (360) but what I would like to do is average the size of two regions and save that number in a Matrix (360 x 360) so that each node contains information about the average size of the two regions.

Any help would be appreciated, thanks!!

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Johanna Popp 2022-1-2

编辑：Johanna Popp 2022-1-2

You're right, that could be helpful. Lets say I have a vector of 5 numbers [2 4 8 9 12]. I want to create a matrix with the size 5*5 containing the average of each of the respective pairs of numbers in the corresponding field of the matrix. In this case it would be

[2 3 5 5.5 7; 3 4 6 6.5 8; 5 6 8 8.5 10; 5.5 6.5 8.5 9 10.5; 7 8 10 10.5]

Instead of the 5*1 vector that I provided here as a example, I am working with a vector containing 360 numbers.

I hope this helps, thank you!