How to calculate slope/gradient in 3D surface data

I have this matlab data that looks like this,

X = 1:15;
Y = [5 5 5 10 15 20 25 25 25  20 15 10 5 5 5];
dx = 1;
dy = 1;

Z = (ones(numel(X),1)*Y)+ randn(15,15)

figure
surf(Z)

ylabel('y-axis [um]');
xlabel('x-axis [um]');
zlabel('z-axis [um]');

Im trying to find a way to automatically determine the slope of this 3D surface but I couldnt find it. Can anyone help me?

Answer 1

[Ameer Hamza]

See gradient(): https://www.mathworks.com/help/matlab/ref/gradient.html

X = 1:15;
Y = [5 5 5 10 15 20 25 25 25  20 15 10 5 5 5];
dx = 1;
dy = 1;
Z = (ones(numel(X),1)*Y)+ randn(15,15);

figure
surf(Z)
title('surface');

figure
surf(gradient(Z))
title('gradient');

[Seven Nguyen]

thanks