Converting 3D data to 2D

2017 12 6
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I have a 50x4 matrix with the columns being x, y, z, and a value. I want to average each x,y point through the z to convert my 3D data to a 2D.

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Walter Roberson
Walter Roberson 2017-12-6
Does your data form a regular grid, perhaps 5 x 5 x 2 ?
Or is it scattered data that is not on a grid?
Josh K
Josh K 2017-12-6
It is a 5 x 5 x 2. I eventually want to read in much larger data sets but I want to get a working code for this size first.

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Jos (10584)
Jos (10584) 2017-12-6

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So, you want to ignore the z, and average the values for each specific combination of (x,y)?
xyzv = [1 1 1 10 ; 1 1 2 20 ; 1 2 3 30 ; 1 2 5 40 ; 2 2 4 10] % test data
[xy,~,j] = unique(xyzv(:,[1 2]),'rows') % unique combinations of (x,y)
xyv = [xy accumarray(j,xyzv(:,4),[size(xy,1),1],@mean)] % ignore z, average v

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