draw a 3d graph with mat function
显示 更早的评论
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
2 个评论
Cris LaPierre
2021-10-20
Without knowing what it is you expected, it's hard to know what is wrong.
Nhan Tran
2021-10-20
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
采纳的回答
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)
更多回答（1 个）
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)
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