清空筛选条件
清空筛选条件

How do I plot grid points in a wedge-shaped volume?

2 次查看（过去 30 天）
Edwin
Edwin 2022-11-29
回答： Jonas 2022-11-29
In the below code, how do I modify so that it gives me 3D plot of grid points? Right now I am only getting 2D plot.
yq=repmat(-10:10,100);
xq=repmat(-10:10,100)';
r=10;
teta=0:0.01:pi/6;
teta1=pi/4;
xv=[0 r*cos(teta)];
yv=[0 r*sin(teta)];
zv=0:.1:10;
[in,on] = inpolygon(xq,yq,xv,yv);
h=10^-10;
a=numel(in);
b=a*10/h;
sz=0.3;
figure (1)
plot(xv,yv) % polygon
axis equal
hold on
plot(xq(in),yq(in),'r+') % points inside
plot(xq(~in),yq(~in),'bo') % points outside
hold on
figure (2)
[X,Y,Z]=meshgrid(xv,yv,zv);
hold off

请先登录，再回答此问题。

回答（1 个）

Jonas
Jonas 2022-11-29
Ran in:
you could add the third dimension like that:
x=-6:6;
[X,Y,Z]=meshgrid(x);
r=5;
phi=pi/2; % from [0,pi]
theta=pi/4; % from [0,2pi)
Xin=X<=sin(phi)*cos(theta);
Yin=Y<=sin(phi)*sin(theta);
Zin=Z<=cos(phi);
allIn=Xin & Yin & Zin & (sqrt(X.^2+Y.^2+Z.^2)<=r);
plot3(X(allIn),Y(allIn),Z(allIn),'ro','MarkerFaceColor','r')
hold on;
plot3(X(~allIn),Y(~allIn),Z(~allIn),'b.')
hold off;
xlabel('x'); ylabel('y'); zlabel('z');
view(-12.3,37.8)

类别

在 Help Center 和 File Exchange 中查找有关 Surface and Mesh Plots 的更多信息

标签

产品


版本

R2022b

Community Treasure Hunt

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

Start Hunting!

Translated by