3D matrix, max in z direction

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lunalara
lunalara on 7 Aug 2016
Commented: Rik on 17 Feb 2021
Hello all ,
I am working with data arranged in a large 3D matrix and am wondering how I might find the maximum value in the Z direction of all elements at a specific x,y coordinate.
For example, if:
A = [1 2 3; 4 7 8]
B = [6 4 2; 3 5 7]
C = [3 3 9; 2 3 2]
and i arrange the matrix as such:
data_3d = cat(3, A, B, C)
I would like to find the maximum value of all 'z' elements positioned at the x,y coordinates(1,1) compared to each other, where: max_1 = 6
Is there a simple function to do this, or is it necessary to call each individual element in the following manner:
max_1 = max([A(1,1) B(1,1) C(1,1)])
(will this ^ even work?)
A bit of a matlab newbie, and any help is greatly appreciated. :) Thank you for your time

Accepted Answer

Star Strider
Star Strider on 7 Aug 2016
Try this:
max_data_3d = max(data_3d, [], 3)
max_data_3d =
6 4 9
4 7 8
  4 Comments
lunalara
lunalara on 8 Aug 2016
Star, you have made my day.
It would probably be much easier to get the full maximum beforehand, then just pick and choose which values are important from the resulting matrix like you said.
Thank you so much for your help!!
Star Strider
Star Strider on 8 Aug 2016
As always, my pleasure!

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More Answers (1)

Fathia Mohammed
Fathia Mohammed on 17 Feb 2021
max(A,[],3)
  1 Comment
Rik
Rik on 17 Feb 2021
How is this different from what Star Strider posted?

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