plotting specific data points on a cone plot.

Hello,

i am programming a conex programming problem iteratively. I get global optimum solution in, say N iterations.

The solution of each iteration is to be plotted as a data point on a conic plot such that I want represent the convergence shape as a cone.

I know how to draw a 3d cone but how to add data points?

Answer 1

[Morgan]

If you have the x, y, and z coordinates of the data points you can use plot3

hold on
plot3(x(:),y(:),z(:),'.r','MarkerSize',12)

Doing this will give you something like this

There is lots of things you can do to dress the plot up further from there if you take a look at plot3 documentation. Here is the code I used to generate it:

% NUMBER OF POINTS
N = 100;

% GRID SIZE
Nx = 101;
Ny = 101;

% GRID AXES
xa = linspace(-1,+1,Nx);
ya = linspace(-1,+1,Ny);

% MESHGRID
[X,Y] = meshgrid(xa,ya);

% CALCULATE CONE
C = 2*sqrt(X.^2 + Y.^2);

% CALCULATE RANDOMIZED DATA POINTS
x = -1 + 2*rand([1 N]);
y = -1 + 2*rand([1 N]);
z = 2*sqrt(x.^2 + y.^2);

% SHOW CONE
surf(X,Y,C)
shading interp
axis equal tight
zlim([ 0 2 ]);
clim([ 0 2 ]);
colorbar

% ADD DATA POINTS TO PLOT
hold on
plot3(x(:),y(:),z(:),'.r','MarkerSize',12);

[SRINIVAS STP]

Thank you very much. It workedout for my problem.