Scatter3 : How do I add 4th variable to Data Tips?

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Roger Breton
Roger Breton 2021년 12월 22일
댓글: Cris LaPierre 2021년 12월 22일
I have this code going :
h=scatter3(Lab(2,:),Lab(3,:),Lab(1,:),80,RGB,'fill');
xlabel('b*'),ylabel('a*'),zlabel('L*');
title('CIE-L*a*b* coordinates');
axis([min_Lab(3) max_Lab(3) min_Lab(2) max_Lab(2) min_Lab(1) max_Lab(1)]);grid on;hold on;
% draw black lines indicating axis
line([min_Lab(3) max_Lab(3)],[0 0],[0 0],'color',[0 0 0],'lineWidth',linewidth); % Axis L* == a* == 0
line([0 0],[min_Lab(2) max_Lab(2)],[0 0],'color',[0 0 0],'lineWidth',linewidth); % Axis L* == b* == 0
line([0 0],[0 0],[min_Lab(1) max_Lab(1)],'color',[0 0 0],'lineWidth',linewidth); % Axis a* == b* == 0
% Redefine labels
h.DataTipTemplate.DataTipRows(1).Label = 'b';
h.DataTipTemplate.DataTipRows(2).Label = 'a=';
h.DataTipTemplate.DataTipRows(3).Label = 'L=';
h.DataTipTemplate.DataTipRows(3).Label = 'DE76='; <------ 4th Variable here!
% Show datatip
datatip(h, h.XData(1),h.YData(1),h.ZData(1));
I would like to add a fourth variable to the Data Tip as shown below :
Now, somehow (?), I need to pass the DE76 variable as argument to the datatip() function?
The problem, as I see it, is that datatip seem to only take its arguments from the figure handle, h :
datatip(h, h.XData(1),h.YData(1),h.ZData(1));
How could I possibly access my DeltaE variable, which is sitting in a different array :
DE76 =
0.2309 6.5948 6.3132
20.8147 15.0842 2.2396
0.7225 41.3219 55.9979
1.2122 0.9848 4.2285
I was thinking of, perhaps, adding a fourth row to the LabEpson array which would only contains Lab values otherwise. But they wouldn't be part of the "figure" h structure? This is where I'm lost...
I'll try to find the answer on my own...

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Cris LaPierre
Cris LaPierre 2021년 12월 22일
  댓글 수: 7
Cris LaPierre
Cris LaPierre 2021년 12월 22일
I don't understand the specifics of the data in your plot, but data tips correspond to actual datapoints in the axes. They should not appear where there is no data. Since DE76 must be the same length as the data on X, Y, and Z, you should always have data for all 4 rows of the data tip.
Your code has changed the datatip template, so that, in this figure, it will always have 4 rows. If there is an (X,Y,Z) datapoint that should not have a DE76 value, you could make that element's value in DE76 be NaN.

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