MARK A POINT ON A 3D PLOT

Please, I plotted my x,y,z combinations as shown in the figure below. The x,y,z combination is 636,056 (data size). My optimal x,y,z point is highlighted with red. However, the highlighted POINT is not SHOWING ON THE 3D PLOT. I guess this is due to the data size. Becuause, when I tried with few data size, it appears perfectly. Please, how do I solve this problem with my large data size. I want my plot to look similar to this Figure. Thank you.

[Habeeb]

Here is my MATLAB Code

plot3(x0Grid(:,1),x0Grid(:,2),x0Grid(:,3));

hold on

plot3(x0Grid(idx),x0Grid(idx),x0Grid(idx),'ro','MarkerFaceColor','red','MarkerEdgeColor','red','MarkerIndices',10);

[dpb]

You've drawn a 3D scatter(?) plot; the other image is 2D surface.

You've got data in the cubic space that is essentially solid with the number of points and the axes size and undoubtedly the location of the maximum is somewhere in the middle and so is occluded.

You could try setting the MarkerEdgeAlpha and MarkerFaceAlpha properties to something less than 1 (the default) to see if that will let the other point show through.

[Habeeb]

Hi dpb. I did as you suggested. Even thought the ploted data appears faded from the legend. However, due to the size of the ploted data, it still occludes the Optimal Point. Please see attahced.

[dpb]

What did you set alpha to? Doesn't look very much less...try 0.1 and see what happens.

You can't see through a solid wall, it takes a window glass--same thing here; the data points are bricks.

I don't know anyway you will be able to have a point buried in the middle to show up -- oh!

Show us the code -- how are you putting the highlight on the one point?

You possibly could plot the point last and then have it on top layer instead...

[Habeeb]

I used 0.2

Here is the code.

h = scatter3(x0Grid(:,1),x0Grid(:,2),x0Grid(:,3));

hold on

scatter3(Optimal_k(:,1),Optimal_k(:,2),Optimal_k(:,3),'MarkerFaceColor','r','MarkerEdgeColor','k');

h.MarkerFaceAlpha = .2;

h.MarkerEdgeAlpha = .2;

[Habeeb]

Here is the code and result with MarkerFaceAlpha = 0.1

>> h = scatter3(x0Grid(:,1),x0Grid(:,2),x0Grid(:,3));

hold on

scatter3(Optimal_k(:,1),Optimal_k(:,2),Optimal_k(:,3),'MarkerFaceColor','r','MarkerEdgeColor','k');

h.MarkerFaceAlpha = .1;

h.MarkerEdgeAlpha = .1;

[dpb]

So, you can begin to see the dot...try 0.01.

Where's the code to write the max point in the above?

What's the point of plotting so many points as to make just a solid cube, anyways?

[Habeeb]

It works now with the 0.01 . Please, see code below and the attached. Many thansk, dpb. regards.

h = scatter3(x0Grid(:,1),x0Grid(:,2),x0Grid(:,3));
hold on
scatter3(Optimal_k(:,1),Optimal_k(:,2),Optimal_k(:,3),'MarkerFaceColor','r','MarkerEdgeColor','r');
 h.MarkerFaceAlpha = .01;
h.MarkerEdgeAlpha = .01;