Plotting Gradient of Multivariable function.

I am Trying to Plot Grad of This Multimaviable Funtion...

the Chunk of My code as follows,

syms x y

f(x,y)=exp(-x.^2)+exp(-y.^2);

g=gradient(f,[x,y]);

disp(g);

[X, Y] = meshgrid(-1:.1:1,-1:.1:1);

G1 = subs(g(1),[x y],{X,Y});

G2 = subs(g(2),[x y],{X,Y});

quiver(X,Y,G1,G2)

my error is : "Error using symfun/subsref (line 172)

Symbolic function expected 2 input arguments but received 1.

Error in Untitled (line 14)

G1 = subs(g(1),[x y],{X,Y});"

please HElp me with this....

Answer 1

[Tanmay Das]

Hi Nishanth,

You can make multiple substitution using subs function in either of the two ways given below:

1) Make multiple substitutions by specifying the old and new values as vectors.

G1 = subs(g(1),[x,y],[X,Y]);

2) Alternatively, for multiple substitutions, use cell arrays.

G1 = subs(g(1),{x,y},{X,Y});