MATLAB: Removing zero data from Scatter3 figure

barcolormapdata cleaningplotscatter3

I want to remove the zeros from the P matrix so the that they have transparent color on Scatter3 plot. I tried P(P==0)=NaN but the data still has a blue color. How do I set zero data (blue) to transparent color.

[x,y,z] = meshgrid(1:50,1:200,1:200); scatter3(y(:),z(:),x(:),5, P(:) ,'marker','.')

Best Answer

What is "transparent color"? Do you want the points to vanish? Then:

[x,y,z] = meshgrid(1:50,1:200,1:200);
keep = (P(:) ~= 0);
x    = x(keep);
y    = y(keep);
z    = z(keep);
scatter3(y(:), z(:), x(:), 5, P(:) ,'marker', '.')

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MATLAB: Plot 3d set of data(x,y,z) colored by the z coordinate

You can test with the input data "Book1.txt" (~900points)

scatter3(P(:,1),P(:,2),P(:,3),9,P(:,3),'.'); %9 is the size of point
colormap(jet); % or other colormap
colorbar; % color bar

See the result:

MATLAB: How to associate the markers of the SCATTER3 plot with a color map in MATLAB 7.10 (R2010a)

To control how your SCATTER3 markers are colored you can make use of the CData property of your graphic object.

CData controls the color of markers. If you would like to map your points with a colormap you can use a vector with the same length of your XData and YData then the values in CData are linearly mapped to the colors in the current colormap.

Please consider the following code as an example:

%%Define data
[x,y,z] = sphere(16);
X = [x(:)*.5 x(:)*.75 x(:)];
Y = [y(:)*.5 y(:)*.75 y(:)];
Z = [z(:)*.5 z(:)*.75 z(:)];
%%Create Scatter3 plot with CDATA value Z
scatter3(X(:),Y(:),Z(:),'CData',Z(:))
colorbar

In this case the Z value has been used to define the colormap but you can consider any other different map you may like by inserting a different vector with the same size of X and Y.

Best Answer

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MATLAB: Plot 3d set of data(x,y,z) colored by the z coordinate

MATLAB: How to associate the markers of the SCATTER3 plot with a color map in MATLAB 7.10 (R2010a)

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