How to find the center of matrix

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Mingde
Mingde on 25 May 2022
Commented: Image Analyst on 27 May 2022
Dear all helper,
I want like to calculate the center of force in 2 point that I draw in the red color by using matlab.
Here is attech file of the csv data.
  3 Comments
DGM
DGM on 25 May 2022
Your data is 14925x10, with periodic rows of NaN every 17 rows. It's not clear what this data represents or how the NaNs should be treated. Is this a contiguous 2D region? Multiple independent 2D regions? A 3D volume? Are the NaN rows merely delimiters/breaks to be discarded, or do they have numerical meaning? If they are to be kept, how should they be handled?

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Accepted Answer

DGM
DGM on 25 May 2022
Edited: DGM on 25 May 2022
This seems fairly straightforward.
% a test array
F = zeros(5);
F(2,2) = 10;
F(4,4) = 10;
% global sum of F
Ft = sum(F(:))
Ft = 20
% coordinates of F centroid
cy = sum((1:size(F,1)).'.*sum(F,2))/Ft
cy = 3
cx = sum((1:size(F,2)).*sum(F,1))/Ft
cx = 3
% visualize the result
imshow(F,[]); hold on
plot(cx,cy,'*','markersize',20)
  5 Comments
Image Analyst
Image Analyst on 27 May 2022
You never answered his questions about whether your multiple regions are to be treated as a single region, or whether you want the location of the centroid for each region individually. But he gave you the centroid of all regions as if they were a single region and you accepted so I guess that's what you wanted.

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More Answers (1)

Image Analyst
Image Analyst on 26 May 2022
Did you try
data(isnan(data)) = 0;
mask = data ~= 0;
props = regionprops('table', mask, data, 'WeightedCentroid');
  1 Comment
Mingde
Mingde on 27 May 2022
Thank you for your answer.

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