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

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?

[Walter Roberson]

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.

Answer 1

[rajat aggarwal]

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

[Walter Roberson]

Note that ezplot() is not recommended anymore. It uses older technology to create the plot. fplot() is a better choice in most cases now.