Is there any method to specifically point few operating points in 3D surf ?

My Z axis is the output where I need waveform interpolation with operating points.

Answer 1

[Voss]

Maybe this is helpful:

% make a surface using surf()
N = 10;
X = 1:N;
Y = 1:N;
Z = peaks(N);
surf(X,Y,Z)

% pick some points to highlight
idx = Z > 2;

% plot those points using plot3()
hold on
[r,c] = find(idx);
plot3(X(c),Y(r),Z(idx),'.r','MarkerSize',12)