Error Z must be a matrix, not a scalar or vector.

prompt = 'what is the value of x';

prompt2 = 'what is value of y'; 

x = input(prompt);

y = input(prompt2); 

u = 10*sin(200*x)+0.1*cos(10*y)+(100*x)/y;

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

Z = u

figure 

mesh(Z)

Also, how would I use the element wise operator in this code?

Answer 1

[Star Strider]

I prefer inputdlg to input, but that’s a personal preference and not a criticism of your code in that regard.

As best I can determine, you have your statements in the wrong order. Also, you need to define ranges for ‘x’ and y, not simply scalar values.

See if something like:

x = 1:10;
y = 20:30;

u = @(x,y) 10*sin(200*x)+0.1*cos(10*y)+(100*x)./y;          % Create Anonymous Function From ‘u’

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

Z = u(X,Y);

figure(1)
mesh(X, Y, Z)

That works for me when I run it. The only changes I made in your code otherwise were to vectorise the division in ‘u’, to create a call to ‘u’ in your ‘Z’ assignment, and to add ‘X’ and ‘Y’ to your mesh call, because those tend to produce better (and more understandable) plots.