How can I create a legend for an event data plot?

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Erica Kamphorst 2020-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/545909-how-can-i-create-a-legend-for-an-event-data-plot

评论： Adam Danz 2020-6-12

I have created plots for event time-series data. The input data consists of csv files with 3 colums: onsett time, ofsett time, code (integers, from 1-9). I have first created a color array, to assign a color to each code, which looks something like this:

momAffectcolor={1, [RGB triplet];

2, (RGB triplet]; etc}

Following is a for loop that loops through each code consecutively, graps the right color from the color array, and plots the code at the right time (from onsett to ofsett). Now, I would like to create a legend for this plot based on the color array, but have not succeeded to do so. Any ideas are welcome!

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Answer 1

Adam Danz 2020-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/545909-how-can-i-create-a-legend-for-an-event-data-plot#answer_449321

The easiest method IMO is to use the DisplayName property of (most) graphics objects.

Here's a demo using loops.

It defines all of the legend strings before the loop and then applies the legend strings within the loop.

Alternatively, you could build the legend strings within the loop using sprintf() or compose().

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Erica Kamphorst 2020-6-11

编辑：Erica Kamphorst 2020-6-12

在 MATLAB Online 中打开

PP21 with legend.PNG

Thank you for your quick reply! Sadly it does not solve my legend problem, I think this is because of the specific way in which event data is plotted. My code loops through each eventcode (e.g. mother giving an instruction, mom being silent etc) consecutively, and plots each event occurence for this specific eventcode, before turning ot the next eventcode category. I have added a figure display of what this looks like, with the legend that I obtain when I use the DisplayName option.

This is the complete code, which might be helpfull for considering adaptive options for creating a legend:

figure(pID);
hold on;
for curKAffectState=[1:9]
    curKAffColor=KAffectColor{curKAffectState,2};
    curKAffValue=KAffectColor{curKAffectState,1};
    curKAxisPos=KAffectColor{curKAffectState,3};
    
    indices=find(kData(:,3)==curKAffValue);
    dataKRows=kData(indices,:);
    countKRows=size(dataKRows,1);
    
    for row=1:countKRows
        hold on
        plot(dataKRows (row, [1 2]),[curKAxisPos curKAxisPos], 'Color',curKAffColor, 'LineWidth',10);
    end
end

Erica Kamphorst 2020-6-12

Thank you very much! I know it is not 'cool' to use this word, but it is very cool to see that it works!

Adam Danz 2020-6-12

"Cool" is still a cool word ;)

"Rad", on the other hand, might be outdated :D

If you have any problems with the the legendUnq function, please let me know. If it works well, you can support it by leaving a rating on the file exchange.

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