MATLAB: 3D point label a in plot

3d points plot

how can I label a point in a 3D plot at x,y,z coordinates?

Sounds like you want to use the text command.

For example:

[X,Y] = meshgrid(-pi:pi/16:pi);
Z = cos(X).*sin(Y);
surf(X,Y,Z)
text(X(26,17),Y(26,17),Z(26,17)+0.1,'Peak')

Try fimplicit3()

fimplicit3(@(x,y,z) cos(x) + cos(y) + cos(z))


x = linspace(0,3) ;
y = linspace(0,3) ;
[X,Y] = meshgrid(x,y) ;
Z = 1-X.^2 ;
surf(X,Y,Z)
shading interp