3. ERROR
 
t = input("Enter the values of t: ");
v = input("Enter values of v: ");
v = v';
t = t';
t2 = t.^2;
t3 = t.^3;
t = [t t2 t3];
ones_vector = ones(1, size(t, 1));
t = [ones_vector' t];
display(t);
a = inv(t' * t) * t' * v;
a = a';
t1 = input("Enter a time: ");
result = a(1) + t1 * a(2) + a(3)*t1.^2 + a(4)*t1.^3;
result2 = 392.19;
display(result);

err = abs(result - result2) / result*100;
display(err)

//// 3rd order/////
t = input("Enter the values of t: ");
v = input("Enter values of v: ");
v = v';
t = t';
t2 = t.^2;
t3 = t.^3;
t = [t t2 t3];
ones_vector = ones(1, size(t, 1));
t = [ones_vector' t];
display(t);
a = inv(t' * t) * t' * v;
a = a';
t1 = input("Enter a time: ");
result = a(1) + t1 * a(2) + a(3)*t1.^2 + a(4)*t1.^3;; 
display(result);

///// 2nd order /////

t = input("Enter the values of t: ");
v = input("Enter values of v: ");
v = v';
t = t';
t2 = t.^2;
display(t2);
t = [t t2];
display(t);
ones_vector = ones(1, size(t, 1));
t = [ones_vector' t];
a = inv(t' * t) * t' * v;
a = a';
t1 = input("Enter a time: ");
result = a(1) + t1 * a(2) + a(3)*t1.^2; 
display(result);