I want to make a function that plots 3D quadratic surface

20 次查看（过去 30 天）
Maryam Abdelhamid
评论： Walter Roberson 2020-5-18
I want to creat a function that returns a graph of hyperbolic paraboloid just by entring the coefficient of x^2,y^2 and z
function hyperbolicparaboloid(A,B,C)
A=input('enter coeffecient of x^2');
B=input('enter coeffecient of y^2');
C=input('enter coeffecient of z');
%y^2/b^2-x^2/a^2=z/c
%where B=1/b^2, A=1/a^2, C=1/c
X=linspace(-10,10,100);
Y=linspace(-10,10,100);
Z=linspace(-10,10,100);
[X,Y]=meshgrid(X,Y);
Z=((Y.^2*B)-(X.^2*A))./C;
mesh(X,Y,Z);
view([130,30])
end
Althoug the code is working the function cannot be created
so what is the problem with this function?
  1 个评论
Walter Roberson
Walter Roberson 2020-5-9
What is the point of accepting three input parameters and then promptly ignoring them? You should either have your function not accept any parameters or else you should have your function use the A, B, C values passed in.
Z=linspace(-10,10,100);
That statement is not productive: you overwrite the Z you create there.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

rajat aggarwal
rajat aggarwal 2020-5-18
编辑：rajat aggarwal 2020-5-18
You can use ezplot to draw hyperbolic paraboloid
https://www.mathworks.com/help/matlab/ref/ezplot.html
following links can also help
https://www.researchgate.net/post/How_can_I_plot_hyperbola_in_MATLAB
https://www.mathworks.com/matlabcentral/answers/16688-how-to-draw-a-hyperboloid
https://www.mathworks.com/matlabcentral/answers/313733-can-someone-help-me-graph-this-function#answer_244514
clc;
clear all;
[X,Y,Z] = meshgrid(-10:0.5:10,-10:0.5:10,-10:0.5:10);
a=1;
b=1;
c=1;
V = X.^2/a^2 + Y.^2/b^2 - Z.^2/c^2;
p=patch(isosurface(X,Y,Z,V,1)); % This is the key step. It involves getting the part of the volume corresponding to the surface defined by the equation
set(p,'FaceColor','red','EdgeColor','none');
daspect([1 1 1])
view(3);
camlight
  1 个评论
Walter Roberson
Walter Roberson 2020-5-18
Note that ezplot() is not recommended anymore. It uses older technology to create the plot. fplot() is a better choice in most cases now.

请先登录，再进行评论。

类别

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

标签

Community Treasure Hunt

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

Start Hunting!

Translated by