0
Follow
0
View

# matlab draws 3D graphs under inequality constraints

Part of the answer references GPT, GPT_Pro better solve the problem
Example:

``````code
``````

In order to draw a 3D graph under inequality constraints, it is necessary to specify the drawn functions and constraints first. According to offer you the function and the constraint condition, we can get: the function of T = 1 /((1 + a + 0.25 c(0.75) ^(2)) ^(1/3)), and 0 & lt; a< 1,100 -(0.75a+0.25c)> 0.

Next, we can use the meshgrid function in matlab to set a certain range for the variables A and c and calculate the function values under the inequality constraints. The meshgrid function generates a two-dimensional plane from the set range of A and c to store the values of the function T.

The specific code is as follows:

``````clear;clc;
[a,c] = meshgrid(0:0.1:1); % 两个变量的范围从0到1，步长为0.1
T=(1+(0.75*a+0.25*c).^(-2)).^(-1/3); % 计算不等式约束下的函数值
T(100-(0.75*a+0.25*c)<=0) = NaN;  % 把不满足不等式约束的函数值赋值为NaN
mesh(a,c,T); % 绘制三维图
``````

After the above code is executed, the 3D graph under the inequality constraint can be obtained.

Publish Time
2023-02-26 16:07
Update Time
2023-02-26 16:07