# Plotting data in table after grouping

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Abed Alnaif on 3 Jan 2020
Commented: Adam Danz on 7 Jan 2020
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

Adam Danz on 3 Jan 2020
Edited: Adam Danz on 6 Jan 2020
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
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Adam Danz on 7 Jan 2020