I keep getting this error...

The error is: Error using mesh (line 70) Z must be a matrix, not a scalar or vector.

Here is my code, and I do not know how to correct it so this error does not appear. I am trying to plot a mesh plot of the function I have denoted as g with the x and y intervals that are listed below.

 %defining an x-interval
x = [0:0.2:2];
%defining an y-interval
y = [0:0.2:2];
%writing the equation
g = ((exp(1*-y)).*(sin(x)+cos(x)));
%attempting to solve the function
z= polyval(g, x, y)
%
%saving values for g
save('datafile1.mat', 'z')
%plotting the equation as a mesh
[i,j]= meshgrid(x,y);
mesh (i, j, z)
grid on; 
hold on;

Can someone please help? Please and Thank you!

Answer 1

[Star Strider]

Your polyval call is a bit mystifying. You already have your ‘g’ function defined, so just vectorise it an then plot it.

The Code —

%defining an x-interval
x = [0:0.2:2];
%defining an y-interval
y = [0:0.2:2];
%writing the equation
g = @(x,y) ((exp(-y*1)).*(sin(x)+cos(x)));

[i,j]= meshgrid(x,y);
z = g(i,j);

figure(1)
mesh(i, j, z)
grid on

[Priyanka Bose]

Thank you!

[Star Strider]

As always, my pleasure!