# How to sum of the values of z corresponding to the ranges of x and y?

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SOM il 20 Mar 2023
Commentato: Rik il 22 Mar 2023
Hello,
I have a 3D matrix (x, y ,z) such as:
[1 -5 -2; 0 2 3; 2 -5 -2; -0.5 2 5; -0.8 3 3.5]
Can we find the sum of the values of z corresponding to the ranges of x and y in x, y and z?
For simple example, the sum of z values corresponding to -1<x<1 and 1<y<5.
Any suggestions?
Thank you!
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### Risposte (1)

Rik il 20 Mar 2023
If your ranges grow more complex, you should try to define groups so you can use splitapply. But for this simple example you can simple use logical indexing on your 2D (not 3D) data.
data = [1 -5 -2; 0 2 3; 2 -5 -2; -0.5 2 5; -0.8 3 3.5];
x = data(:,1);
y = data(:,2);
z = data(:,3);
value = sum(z( x>=-1 & x<1 & y>=1 & y<5 ));
disp(value)
11.5000
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SOM il 22 Mar 2023
Spostato: Rik il 22 Mar 2023
Thank you !! It was a great help
Rik il 22 Mar 2023

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