Plotting 3D surface for a variable dependent on 2 variables but the 2 variables are not monotically increasing function

Can anyone help me in plotting a surface for a function which is dependent on two independent variables but the two independent variables are not monotically

increasing variable.Hence am facing issue in plotting the dependent variable based on independent variable.Can somebody please help

Answer 1

[Walter Roberson]

N = 100;
xvec = linspace(min(FirstIndependent), max(FirstIndependent), N);
yvec = linspace(min(SecondIndependent), max(SecondIndependent), N);
[X, Y] = ndgrid(xvec, yvec);
F = scatteredInterpolant(FirstIndependent(:), SecondIndependent(:), Dependent(:));
Z = F(X, Y);
surf(X, Y, Z);