# 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.

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SYED on 5 Apr 2024
Commented: Cris LaPierre on 5 Apr 2024
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)
##### 3 CommentsShow 1 older commentHide 1 older comment
Torsten on 5 Apr 2024
SYED on 5 Apr 2024
no

Cris LaPierre on 5 Apr 2024
Edited: Cris LaPierre on 5 Apr 2024
I think you are not using inline correctly. You likely need to use the following syntax.
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)
##### 2 CommentsShow NoneHide None
SYED on 5 Apr 2024
Moved: Torsten on 5 Apr 2024
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 on 5 Apr 2024
You do not need to use syms.

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