I am not certain what you want.
One option —
first_data = [[3 4 8 1];[3 6 4 9]]; % desired legend (first) & color (green)
second_data = [[1 3 5];[3 2 7];[3 4 2]]; % desired legend (second) & color (cyan)
combine = {first_data,second_data}; % recieving new data in every 'for' loop iteration thats why combining
colours = {'g','c'};
Legend_Names = {'first','second'};
for i = 1:length(combine)
hp{i} = plot(cell2mat(combine(i)),'Color',cell2mat(colours(i)),'LineWidth',2, DisplayName=Legend_Names{i});
hold on;
end
grid on;
legend([hp{1}(1) hp{2}(1)], Location = 'best')
For either of these, it is necessary to return the handles of each plot call, and pass them to the legend call..
EDIT — Ran code again.
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