How to plot 3d line on fit function?

I want to show how works heuristic algorithm. I have my cost function and i want show every step of algorithm. For example i have cod:

load franke
sf = fit([x, y],z,'poly23')
subplot(1,2,1)
plot(sf)
subplot(1,2,2)
X=x(10:15)
Y=y(10:15)
Z=z(10:15)
plot3(X,Y,Z,'-mo')
grid on

How to show both on one 3D plot?

Answer 1

[Kaushik Lakshminarasimhan]

You need to use hold on. For example,

x  = rand(100,1);
y  = rand(100,1);
z  = x.^2 + y;
sf = fit([x, y],z,'poly23')
plot(sf); hold on;
X=x(10:15)
Y=y(10:15)
Z=z(10:15)
plot3(X,Y,Z,'mo')
grid on;

[Jan Kowalski]

So simply ... Thanks man