Is it possible to create a selective legend in a multiplot graph?

Question

Alon Rozen 2018-12-31

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https://ww2.mathworks.cn/matlabcentral/answers/437747-is-it-possible-to-create-a-selective-legend-in-a-multiplot-graph

评论： Alon Rozen 2019-1-1

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Hi all,

I already asked this question in somewhat less clear manner. So now I added a clear code:

I have two sets of data - A_Data and B_Data.

In each set the data has a data ID. So I have A_IDs and B_IDs.

I plot all on the same axis:

% Prepare:
H         = My_Axis; 
Num_Of_A  = length(A_IDs);
Num_Of_B  = length(B_IDs);
Lgnd_Cell = cell(Num_Of_A+Num_Of_B,1); 
Lgnd_Indx = true(Num_Of_A+Num_Of_B,1)
% Plot A data:
for i = 1:Num_Of_A
    Data = Data_A{i}; 
    plot3(H,Data(:,1),Data(:,2),Data(:,3),['Certain_Shape' 'Certain_Color']); 
    hold on; 
    Lgnd_Cell{i} = ['A Data ' num2str(A_IDs(i))]; 
    Lgnd_Indx(i) = Determine_If_To_Show_This_Data_Legend(Data);
end
% Plot B data:
for i = 1:Num_Of_B
    Data = Data_B{i}; 
    plot3(H,Data(:,1),Data(:,2),Data(:,3),['Certain_Shape' 'Certain_Color']); 
    hold on;
    Lgnd_Cell{Num_Of_A+i} = ['A Data ' num2str(B_IDs(i))]; 
    Lgnd_Indx(Num_Of_A+i) = Determine_If_To_Show_This_Data_Legend(Data);
end

Now, based on 'Lgnd_Indx' I want to create a selective legend.

Is it possible?

Thanks,

Alon

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madhan ravi 2018-12-31

what logic?

Alon Rozen 2018-12-31

The logic dosen't matter because it is not the source of the problem. The source is that the legend command marks the legend items orderly acording to their mark and color. If you ommit one the mark and color that you get belong to it and not to the next plot. So the legend will not corrlate the plots and their right mark + color.

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Answer 1

Walter Roberson 2018-12-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/437747-is-it-possible-to-create-a-selective-legend-in-a-multiplot-graph#answer_354496

record the handles returned by plot3. Index them by your Indx array as your first parameter to legend and index the cell by the same as your second parameter to legend