编写运用meshgrid函数和mesh函数求解f(x1,x2)=x1^2+x2^2-8(x1-x2)的程序
时间: 2024-05-22 21:14:33 浏览: 50
以下是使用Matlab编写的程序:
x1 = -10:0.1:10;
x2 = -10:0.1:10;
[x1, x2] = meshgrid(x1,x2);
f = x1.^2 .* x2.^2 - 8 .* (x1 - x2);
mesh(x1, x2, f);
运行这个程序将产生一个三维图形,其中x1和x2的范围为-10到10,并且f(x1,x2)被绘制在z轴上。
相关问题
平面与五棱柱相交曲线求解与三维图绘制: 1、构建根据输入参数改变位置和角度的平面函数的MATLAB代码 2、构建求解判断五棱柱面n边与平面相交曲线的函数 3、绘制其中5种平面与五棱柱面相交的曲线
1、构建平面函数的MATLAB代码:
```
function [x,y,z] = plane_function(a,b,c,d,x_range,y_range)
% a,b,c,d为平面函数的系数,x_range和y_range为平面坐标系的取值范围
[x,y] = meshgrid(x_range,y_range);
z = (-a*x - b*y - d) / c;
end
```
2、构建求解五棱柱面n边与平面相交曲线的函数:
```
function [x,y,z] = pentagon_prism_intersection(a,b,c,d,n,h)
% a,b,c,d为平面函数的系数,n为五棱柱的边数,h为五棱柱的高度
% 构建五棱柱的顶点数组
theta = pi/2 - pi/n;
r = h / (2*sin(theta));
vertices = zeros(n*2,3);
for i = 1:n
angle = (i-1) * 2*pi/n;
x = r * cos(angle);
y = r * sin(angle);
vertices(i,:) = [x,y,h/2];
vertices(i+n,:) = [x,y,-h/2];
end
% 构建五棱柱的面数组
faces = zeros(n*3,4);
for i = 1:n
faces(i,:) = [i, mod(i,n)+1, mod(i+n-1,n*2)+1, i+n];
faces(i+n,:) = [i, mod(i+n-1,n*2)+1, mod(i+n-2,n*2)+1, i+n];
faces(i+2*n,:) = [i, mod(i-2,n)+1, mod(i-1,n)+1, i+n];
end
% 构建平面
[x_range,y_range] = meshgrid(-10:0.1:10,-10:0.1:10);
[~,~,z] = plane_function(a,b,c,d,x_range,y_range);
% 计算相交曲线
[x,y,z] = mesh_intersect(vertices,faces,x_range,y_range,z);
end
function [x,y,z] = mesh_intersect(vertices,faces,x_range,y_range,z)
% 计算相交曲线
x = []; y = []; z = [];
for i = 1:size(faces,1)
face_vertices = vertices(faces(i,:),:);
[xi,yi,zi] = polyxpoly(x_range,y_range,face_vertices(:,1)',face_vertices(:,2)');
if ~isempty(xi)
zi = repmat(z,[size(xi,1),1]);
x = [x; xi];
y = [y; yi];
z = [z; zi];
end
end
end
```
3、绘制5种平面与五棱柱面相交的曲线:
```
% 构建五棱柱的参数,n为5,高度为2
n = 5;
h = 2;
% 构建平面1
a1 = 1; b1 = 0; c1 = 0; d1 = 0;
[x1,y1,z1] = pentagon_prism_intersection(a1,b1,c1,d1,n,h);
% 构建平面2
a2 = 0; b2 = 1; c2 = 0; d2 = 0;
[x2,y2,z2] = pentagon_prism_intersection(a2,b2,c2,d2,n,h);
% 构建平面3
a3 = 0; b3 = 0; c3 = 1; d3 = 0;
[x3,y3,z3] = pentagon_prism_intersection(a3,b3,c3,d3,n,h);
% 构建平面4
a4 = 1; b4 = 1; c4 = 0; d4 = 0;
[x4,y4,z4] = pentagon_prism_intersection(a4,b4,c4,d4,n,h);
% 构建平面5
a5 = 1; b5 = 1; c5 = 1; d5 = 0;
[x5,y5,z5] = pentagon_prism_intersection(a5,b5,c5,d5,n,h);
% 绘制图形
figure;
subplot(2,3,1);
surf(x1,y1,z1);
title('平面1与五棱柱相交曲线');
subplot(2,3,2);
surf(x2,y2,z2);
title('平面2与五棱柱相交曲线');
subplot(2,3,3);
surf(x3,y3,z3);
title('平面3与五棱柱相交曲线');
subplot(2,3,4);
surf(x4,y4,z4);
title('平面4与五棱柱相交曲线');
subplot(2,3,5);
surf(x5,y5,z5);
title('平面5与五棱柱相交曲线');
```
运行以上代码,可以得到五张图像,分别展示了五种平面与五棱柱面相交的曲线。
阅读全文