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

2 views (last 30 days)
SOM on 20 Mar 2023
Commented: Rik on 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!

Rik on 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
##### 2 CommentsShow 1 older commentHide 1 older comment
Rik on 22 Mar 2023

### Categories

Find more on Mathematics in Help Center and File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by