how can i make graph i n which first i want function f(x,y) from user by input command but then i HAVE TO PLOT THAT FUNCTION f(x,y) 3D plot.

how can i make graph i n which first i want function f(x,y) from user by input command but then i HAVE TO PLOT THAT FUNCTION f(x,y) 3D plot. I first convert the function in to inline function using inlne command then i don,t know how to plot 3d graph. because one error always showing conversion from inline to double is not possible

clear

clc

syms x y

a=input('Enter function f(x,y) = ');

b=inline(a);

x=[-2:0.1:2];

y=[-2:0.1:2];

[X,Y]=meshgrid(x,y)

x=X;

y=Y;

z=a;

mesh(z)

[the cyclist]

It sounds like you have already written some code, but it is not working the way you intend. Can you post that code? You can use the paperclip icon in the INSERT section of the tool bar to upload a file, or just paste code.

[Torsten]

Does this help ?

https://uk.mathworks.com/help/matlab/ref/surf.html

[SYED]

no

Answer 1

[Cris LaPierre]

I think you are not using inline correctly. You likely need to use the following syntax.

• f = inline(expr,arg1,arg2,…,argN)

There are many types of 3D plots. Since you haven't specified what type of 3D plot you want, here's an example using surf (surface example taken from here)

F = inline('Y.*sin(X) - X.*cos(Y)','X','Y');

[X,Y] = meshgrid(-5:.5:5);
Z = F(X,Y);
surf(X,Y,Z)

[SYED]

clear

clc

syms x y

a=input('Enter function f(x,y) = ');

b=inline(a);

x=[-2:0.1:2];

y=[-2:0.1:2];

[X,Y]=meshgrid(x,y)

x=X;

y=Y;

z=a;

mesh(z)

[Cris LaPierre]

You do not need to use syms.