Plotting data in table after grouping

Question

Abed Alnaif 2020-1-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/498823-plotting-data-in-table-after-grouping

评论： Adam Danz 2020-1-7

Hello,

I'm trying to plot data in a table after grouping it. If possible, I'd like to avoid using for loops with repeated 'plot' calls, since I think it would be slow. See below for an example of what I'm trying to do. Is there a way to make this code more efficient (e.g., avoid using for loops, or make a single 'plot' call)?

Thank you,

Abed

tbl = table([1;1;1;2;2;2;2;3;3],[0;1;4;0;2;3;5;1;4],rand(9,1),'VariableNames',{'id','t','x'});
uniqueIDs = unique(tbl.id);
figure;
hold on;
for iID = 1:length(uniqueIDs)
    t = tbl.t(tbl.id==uniqueIDs(iID));
    x = tbl.x(tbl.id==uniqueIDs(iID));
    plot(t,x);
end

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Answer 1

Adam Danz 2020-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/498823-plotting-data-in-table-after-grouping#answer_408577

编辑：Adam Danz 2020-1-6

在 MATLAB Online 中打开

arrayfun() is one way to do that.

tbl = table([1;1;1;2;2;2;2;3;3],[0;1;4;0;2;3;5;1;4],rand(9,1),'VariableNames',{'id','t','x'});
figure(); 
hold on
arrayfun(@(i)plot(tbl.t(tbl.id==i),tbl.x(tbl.id==i)),unique(tbl.id)) % do plotting