hey! i am a newbee. i need to make a 3D plot . requirments are :plot y as a function of (x and t), and also plot v as a function of (x and t) . the code is given below. thanks in advance

Answer is supposed to look like above. but it's coming different.

close all;

clear all;

clc;

%% m

x = (0:(1/60):1); % intial data as given by problem

m = length(x);

t = zeros(1,m);

t = (0:(1/60):0.5);

t(1, 32:61) = 0;

y = 40*sin(pi*x); % function vector

theta = [1; 0.2;0.8]; %initial theta

aplha = 0.1;

lambda = 2;

X = ones(m,3);

X(:,2) = x;

X(:,3) = t;

h_theta = X*theta;

h_theta = h_theta';

% error

J = 0;

for i = 1:m

J = J + (h_theta(i)-y(i))^2;

end

J = J/(2*m) ; % error using initial theta

Reg = lambda/(2*m) * sum(theta(2:3,1));

J = J + Reg;

v = pinv(X'*X)*X'*y'; % calculated perms

x1 = (0:0.25:1);

t1 = (0:0.1:0.4);

for i = 1:length(x1)

pol(i) = v(1) + v(2)*x1(i) + v(3)*t1(i);

end

%% 3D Plot

figure()

plot3(x1,t1,pol,'-r')

pol;

%% Mesh plot 3D surface

[X,Y] = meshgrid(x1,t1);

pol = v(1) + v(2).*X + v(3).*Y;

figure()

mesh(X,Y,pol)

figure()

surf(X,Y,pol)