draw a 3d graph with mat function

hi, I'm about plotting a 3D graph from below funcion

(X - 3.14)^2 + (Y - 2.72)^2 + sin(3*X + 1.41) + sin(4*Y - 1.73)

I've tried using but it's not like what I expected. Could someone help

[X, Y] = meshgrid(-10:10);
Z = (X - 3.14).^2 + (Y - 2.72).^2 + sin(3*X + 1.41) + sin(4*Y - 1.73);
surf(X, Y, Z)

Edit 1 (added more context):

hi, I'm making the Optimization for Machine Learning. The post (from the internet) show the plot is very different from what I got in MATLAB (origin image can be found here). I think my code is wrong, and I'm trying to understand how to fix it to get more MATLAB experience

thanks

[Cris LaPierre]

Without knowing what it is you expected, it's hard to know what is wrong.

[Nhan Tran]

hi, I'm making the Optimization for Machine Learning. The post (from the internet) show the plot is very different from what I got in MATLAB (origin image can be found here). I think my code is wrong, and I'm trying to understand how to fix it to get more MATLAB experience

thanks

Answer 1

[Cris LaPierre]

Your code is correct. You just need to increase the resolution of your mesh. Remember that the colon operator steps by 1 by default. Also, the linked figure has an X and Y range of 0-5.

[X, Y] = meshgrid(0:0.1:5);
Z = (X - 3.14).^2 + (Y - 2.72).^2 + sin(3*X + 1.41) + sin(4*Y - 1.73);
surf(X, Y, Z)

[Nhan Tran]

thank you a lot

Answer 2

[Walter Roberson]

You were not sampling finely enough, and you were also plotting outside the desired range.

[X, Y] = meshgrid(linspace(0,2*pi));
Z = (X - 3.14).^2 + (Y - 2.72).^2 + sin(3*X + 1.41) + sin(4*Y - 1.73);
surf(X, Y, Z)

[Nhan Tran]

thank you a lot