tring to plot the 3d and contour levels of a function

the function is z(x,y) = cos(2y-x)sin(2x)

with the range of x and y values mentioned in the code.

my code:

clc
clear

function [z]= contour(x,y)
x=[-pi:0.1:pi./2]
y=[-pi:0.1:pi]
z = cos(2y-x).*sin(2x)
end
 
[xx,yy]=meshgrid(x,y)
zz = cos(2y-x).*sin(2x)
figure
surf(xx,yy,zz)
xlabel('X')
ylabel('Y')
zlable('Z')
shading interp
colorbar

when i run it in the command window it says:

Error: File: contour.m Line: 6 Column: 10
Invalid expression. Check for missing multiplication operator, missing or
unbalanced delimiters, or other syntax error. To construct matrices, use
brackets instead of parentheses.

-this refers to this line of code:

z = cos(2y-x).*sin(2x)

Answer 1

[madhan ravi]

clc
clear
x=-pi:0.1:pi/2
y=-pi:0.1:pi;
[xx,yy]=meshgrid(x,y)
zz = cos(2*yy-x).*sin(2*xx);
       %  ^------------^------ missed it   
figure
surf(xx,yy,zz)
xlabel('X')
ylabel('Y')
zlabel('Z')
shading interp
colorbar